[libgda/LIBGDA_5.4: 1/3] Fix DOC_SOURCE_DIR path



commit 48e0c8d4be620ad1ae49950d1a12ae091134a731
Author: Daniel Espinosa <esodan gmail com>
Date:   Sat Sep 22 21:58:17 2018 -0500

    Fix DOC_SOURCE_DIR path

 INSTALL            | 320 ++++++++++----------
 doc/C/Makefile.am  |   2 +-
 libgda/Gda-5.0.gir | 875 +++++++++++++++++++++++------------------------------
 3 files changed, 534 insertions(+), 663 deletions(-)
---
diff --git a/INSTALL b/INSTALL
index 209984075..8865734f8 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,8 +1,8 @@
 Installation Instructions
 *************************
 
-Copyright (C) 1994-1996, 1999-2002, 2004-2013 Free Software Foundation,
-Inc.
+   Copyright (C) 1994-1996, 1999-2002, 2004-2016 Free Software
+Foundation, Inc.
 
    Copying and distribution of this file, with or without modification,
 are permitted in any medium without royalty provided the copyright
@@ -12,97 +12,96 @@ without warranty of any kind.
 Basic Installation
 ==================
 
-   Briefly, the shell command `./configure && make && make install'
+   Briefly, the shell command './configure && make && make install'
 should configure, build, and install this package.  The following
-more-detailed instructions are generic; see the `README' file for
+more-detailed instructions are generic; see the 'README' file for
 instructions specific to this package.  Some packages provide this
-`INSTALL' file but do not implement all of the features documented
+'INSTALL' file but do not implement all of the features documented
 below.  The lack of an optional feature in a given package is not
 necessarily a bug.  More recommendations for GNU packages can be found
 in *note Makefile Conventions: (standards)Makefile Conventions.
 
-   The `configure' shell script attempts to guess correct values for
+   The 'configure' shell script attempts to guess correct values for
 various system-dependent variables used during compilation.  It uses
-those values to create a `Makefile' in each directory of the package.
-It may also create one or more `.h' files containing system-dependent
-definitions.  Finally, it creates a shell script `config.status' that
+those values to create a 'Makefile' in each directory of the package.
+It may also create one or more '.h' files containing system-dependent
+definitions.  Finally, it creates a shell script 'config.status' that
 you can run in the future to recreate the current configuration, and a
-file `config.log' containing compiler output (useful mainly for
-debugging `configure').
+file 'config.log' containing compiler output (useful mainly for
+debugging 'configure').
 
-   It can also use an optional file (typically called `config.cache'
-and enabled with `--cache-file=config.cache' or simply `-C') that saves
-the results of its tests to speed up reconfiguring.  Caching is
-disabled by default to prevent problems with accidental use of stale
-cache files.
+   It can also use an optional file (typically called 'config.cache' and
+enabled with '--cache-file=config.cache' or simply '-C') that saves the
+results of its tests to speed up reconfiguring.  Caching is disabled by
+default to prevent problems with accidental use of stale cache files.
 
    If you need to do unusual things to compile the package, please try
-to figure out how `configure' could check whether to do them, and mail
-diffs or instructions to the address given in the `README' so they can
+to figure out how 'configure' could check whether to do them, and mail
+diffs or instructions to the address given in the 'README' so they can
 be considered for the next release.  If you are using the cache, and at
-some point `config.cache' contains results you don't want to keep, you
+some point 'config.cache' contains results you don't want to keep, you
 may remove or edit it.
 
-   The file `configure.ac' (or `configure.in') is used to create
-`configure' by a program called `autoconf'.  You need `configure.ac' if
-you want to change it or regenerate `configure' using a newer version
-of `autoconf'.
+   The file 'configure.ac' (or 'configure.in') is used to create
+'configure' by a program called 'autoconf'.  You need 'configure.ac' if
+you want to change it or regenerate 'configure' using a newer version of
+'autoconf'.
 
    The simplest way to compile this package is:
 
-  1. `cd' to the directory containing the package's source code and type
-     `./configure' to configure the package for your system.
+  1. 'cd' to the directory containing the package's source code and type
+     './configure' to configure the package for your system.
 
-     Running `configure' might take a while.  While running, it prints
+     Running 'configure' might take a while.  While running, it prints
      some messages telling which features it is checking for.
 
-  2. Type `make' to compile the package.
+  2. Type 'make' to compile the package.
 
-  3. Optionally, type `make check' to run any self-tests that come with
+  3. Optionally, type 'make check' to run any self-tests that come with
      the package, generally using the just-built uninstalled binaries.
 
-  4. Type `make install' to install the programs and any data files and
+  4. Type 'make install' to install the programs and any data files and
      documentation.  When installing into a prefix owned by root, it is
      recommended that the package be configured and built as a regular
-     user, and only the `make install' phase executed with root
+     user, and only the 'make install' phase executed with root
      privileges.
 
-  5. Optionally, type `make installcheck' to repeat any self-tests, but
+  5. Optionally, type 'make installcheck' to repeat any self-tests, but
      this time using the binaries in their final installed location.
      This target does not install anything.  Running this target as a
-     regular user, particularly if the prior `make install' required
+     regular user, particularly if the prior 'make install' required
      root privileges, verifies that the installation completed
      correctly.
 
   6. You can remove the program binaries and object files from the
-     source code directory by typing `make clean'.  To also remove the
-     files that `configure' created (so you can compile the package for
-     a different kind of computer), type `make distclean'.  There is
-     also a `make maintainer-clean' target, but that is intended mainly
+     source code directory by typing 'make clean'.  To also remove the
+     files that 'configure' created (so you can compile the package for
+     a different kind of computer), type 'make distclean'.  There is
+     also a 'make maintainer-clean' target, but that is intended mainly
      for the package's developers.  If you use it, you may have to get
      all sorts of other programs in order to regenerate files that came
      with the distribution.
 
-  7. Often, you can also type `make uninstall' to remove the installed
+  7. Often, you can also type 'make uninstall' to remove the installed
      files again.  In practice, not all packages have tested that
      uninstallation works correctly, even though it is required by the
      GNU Coding Standards.
 
-  8. Some packages, particularly those that use Automake, provide `make
+  8. Some packages, particularly those that use Automake, provide 'make
      distcheck', which can by used by developers to test that all other
-     targets like `make install' and `make uninstall' work correctly.
+     targets like 'make install' and 'make uninstall' work correctly.
      This target is generally not run by end users.
 
 Compilers and Options
 =====================
 
    Some systems require unusual options for compilation or linking that
-the `configure' script does not know about.  Run `./configure --help'
+the 'configure' script does not know about.  Run './configure --help'
 for details on some of the pertinent environment variables.
 
-   You can give `configure' initial values for configuration parameters
-by setting variables in the command line or in the environment.  Here
-is an example:
+   You can give 'configure' initial values for configuration parameters
+by setting variables in the command line or in the environment.  Here is
+an example:
 
      ./configure CC=c99 CFLAGS=-g LIBS=-lposix
 
@@ -113,21 +112,21 @@ Compiling For Multiple Architectures
 
    You can compile the package for more than one kind of computer at the
 same time, by placing the object files for each architecture in their
-own directory.  To do this, you can use GNU `make'.  `cd' to the
+own directory.  To do this, you can use GNU 'make'.  'cd' to the
 directory where you want the object files and executables to go and run
-the `configure' script.  `configure' automatically checks for the
-source code in the directory that `configure' is in and in `..'.  This
-is known as a "VPATH" build.
+the 'configure' script.  'configure' automatically checks for the source
+code in the directory that 'configure' is in and in '..'.  This is known
+as a "VPATH" build.
 
-   With a non-GNU `make', it is safer to compile the package for one
+   With a non-GNU 'make', it is safer to compile the package for one
 architecture at a time in the source code directory.  After you have
-installed the package for one architecture, use `make distclean' before
+installed the package for one architecture, use 'make distclean' before
 reconfiguring for another architecture.
 
    On MacOS X 10.5 and later systems, you can create libraries and
 executables that work on multiple system types--known as "fat" or
-"universal" binaries--by specifying multiple `-arch' options to the
-compiler but only a single `-arch' option to the preprocessor.  Like
+"universal" binaries--by specifying multiple '-arch' options to the
+compiler but only a single '-arch' option to the preprocessor.  Like
 this:
 
      ./configure CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
@@ -136,105 +135,104 @@ this:
 
    This is not guaranteed to produce working output in all cases, you
 may have to build one architecture at a time and combine the results
-using the `lipo' tool if you have problems.
+using the 'lipo' tool if you have problems.
 
 Installation Names
 ==================
 
-   By default, `make install' installs the package's commands under
-`/usr/local/bin', include files under `/usr/local/include', etc.  You
-can specify an installation prefix other than `/usr/local' by giving
-`configure' the option `--prefix=PREFIX', where PREFIX must be an
+   By default, 'make install' installs the package's commands under
+'/usr/local/bin', include files under '/usr/local/include', etc.  You
+can specify an installation prefix other than '/usr/local' by giving
+'configure' the option '--prefix=PREFIX', where PREFIX must be an
 absolute file name.
 
    You can specify separate installation prefixes for
 architecture-specific files and architecture-independent files.  If you
-pass the option `--exec-prefix=PREFIX' to `configure', the package uses
+pass the option '--exec-prefix=PREFIX' to 'configure', the package uses
 PREFIX as the prefix for installing programs and libraries.
 Documentation and other data files still use the regular prefix.
 
    In addition, if you use an unusual directory layout you can give
-options like `--bindir=DIR' to specify different values for particular
-kinds of files.  Run `configure --help' for a list of the directories
-you can set and what kinds of files go in them.  In general, the
-default for these options is expressed in terms of `${prefix}', so that
-specifying just `--prefix' will affect all of the other directory
+options like '--bindir=DIR' to specify different values for particular
+kinds of files.  Run 'configure --help' for a list of the directories
+you can set and what kinds of files go in them.  In general, the default
+for these options is expressed in terms of '${prefix}', so that
+specifying just '--prefix' will affect all of the other directory
 specifications that were not explicitly provided.
 
    The most portable way to affect installation locations is to pass the
-correct locations to `configure'; however, many packages provide one or
+correct locations to 'configure'; however, many packages provide one or
 both of the following shortcuts of passing variable assignments to the
-`make install' command line to change installation locations without
+'make install' command line to change installation locations without
 having to reconfigure or recompile.
 
    The first method involves providing an override variable for each
-affected directory.  For example, `make install
+affected directory.  For example, 'make install
 prefix=/alternate/directory' will choose an alternate location for all
 directory configuration variables that were expressed in terms of
-`${prefix}'.  Any directories that were specified during `configure',
-but not in terms of `${prefix}', must each be overridden at install
-time for the entire installation to be relocated.  The approach of
-makefile variable overrides for each directory variable is required by
-the GNU Coding Standards, and ideally causes no recompilation.
-However, some platforms have known limitations with the semantics of
-shared libraries that end up requiring recompilation when using this
-method, particularly noticeable in packages that use GNU Libtool.
-
-   The second method involves providing the `DESTDIR' variable.  For
-example, `make install DESTDIR=/alternate/directory' will prepend
-`/alternate/directory' before all installation names.  The approach of
-`DESTDIR' overrides is not required by the GNU Coding Standards, and
+'${prefix}'.  Any directories that were specified during 'configure',
+but not in terms of '${prefix}', must each be overridden at install time
+for the entire installation to be relocated.  The approach of makefile
+variable overrides for each directory variable is required by the GNU
+Coding Standards, and ideally causes no recompilation.  However, some
+platforms have known limitations with the semantics of shared libraries
+that end up requiring recompilation when using this method, particularly
+noticeable in packages that use GNU Libtool.
+
+   The second method involves providing the 'DESTDIR' variable.  For
+example, 'make install DESTDIR=/alternate/directory' will prepend
+'/alternate/directory' before all installation names.  The approach of
+'DESTDIR' overrides is not required by the GNU Coding Standards, and
 does not work on platforms that have drive letters.  On the other hand,
 it does better at avoiding recompilation issues, and works well even
-when some directory options were not specified in terms of `${prefix}'
-at `configure' time.
+when some directory options were not specified in terms of '${prefix}'
+at 'configure' time.
 
 Optional Features
 =================
 
    If the package supports it, you can cause programs to be installed
-with an extra prefix or suffix on their names by giving `configure' the
-option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'.
-
-   Some packages pay attention to `--enable-FEATURE' options to
-`configure', where FEATURE indicates an optional part of the package.
-They may also pay attention to `--with-PACKAGE' options, where PACKAGE
-is something like `gnu-as' or `x' (for the X Window System).  The
-`README' should mention any `--enable-' and `--with-' options that the
+with an extra prefix or suffix on their names by giving 'configure' the
+option '--program-prefix=PREFIX' or '--program-suffix=SUFFIX'.
+
+   Some packages pay attention to '--enable-FEATURE' options to
+'configure', where FEATURE indicates an optional part of the package.
+They may also pay attention to '--with-PACKAGE' options, where PACKAGE
+is something like 'gnu-as' or 'x' (for the X Window System).  The
+'README' should mention any '--enable-' and '--with-' options that the
 package recognizes.
 
-   For packages that use the X Window System, `configure' can usually
+   For packages that use the X Window System, 'configure' can usually
 find the X include and library files automatically, but if it doesn't,
-you can use the `configure' options `--x-includes=DIR' and
-`--x-libraries=DIR' to specify their locations.
+you can use the 'configure' options '--x-includes=DIR' and
+'--x-libraries=DIR' to specify their locations.
 
    Some packages offer the ability to configure how verbose the
-execution of `make' will be.  For these packages, running `./configure
+execution of 'make' will be.  For these packages, running './configure
 --enable-silent-rules' sets the default to minimal output, which can be
-overridden with `make V=1'; while running `./configure
+overridden with 'make V=1'; while running './configure
 --disable-silent-rules' sets the default to verbose, which can be
-overridden with `make V=0'.
+overridden with 'make V=0'.
 
 Particular systems
 ==================
 
-   On HP-UX, the default C compiler is not ANSI C compatible.  If GNU
-CC is not installed, it is recommended to use the following options in
+   On HP-UX, the default C compiler is not ANSI C compatible.  If GNU CC
+is not installed, it is recommended to use the following options in
 order to use an ANSI C compiler:
 
      ./configure CC="cc -Ae -D_XOPEN_SOURCE=500"
 
 and if that doesn't work, install pre-built binaries of GCC for HP-UX.
 
-   HP-UX `make' updates targets which have the same time stamps as
-their prerequisites, which makes it generally unusable when shipped
-generated files such as `configure' are involved.  Use GNU `make'
-instead.
+   HP-UX 'make' updates targets which have the same time stamps as their
+prerequisites, which makes it generally unusable when shipped generated
+files such as 'configure' are involved.  Use GNU 'make' instead.
 
    On OSF/1 a.k.a. Tru64, some versions of the default C compiler cannot
-parse its `<wchar.h>' header file.  The option `-nodtk' can be used as
-a workaround.  If GNU CC is not installed, it is therefore recommended
-to try
+parse its '<wchar.h>' header file.  The option '-nodtk' can be used as a
+workaround.  If GNU CC is not installed, it is therefore recommended to
+try
 
      ./configure CC="cc"
 
@@ -242,26 +240,26 @@ and if that doesn't work, try
 
      ./configure CC="cc -nodtk"
 
-   On Solaris, don't put `/usr/ucb' early in your `PATH'.  This
+   On Solaris, don't put '/usr/ucb' early in your 'PATH'.  This
 directory contains several dysfunctional programs; working variants of
-these programs are available in `/usr/bin'.  So, if you need `/usr/ucb'
-in your `PATH', put it _after_ `/usr/bin'.
+these programs are available in '/usr/bin'.  So, if you need '/usr/ucb'
+in your 'PATH', put it _after_ '/usr/bin'.
 
-   On Haiku, software installed for all users goes in `/boot/common',
-not `/usr/local'.  It is recommended to use the following options:
+   On Haiku, software installed for all users goes in '/boot/common',
+not '/usr/local'.  It is recommended to use the following options:
 
      ./configure --prefix=/boot/common
 
 Specifying the System Type
 ==========================
 
-   There may be some features `configure' cannot figure out
+   There may be some features 'configure' cannot figure out
 automatically, but needs to determine by the type of machine the package
 will run on.  Usually, assuming the package is built to be run on the
-_same_ architectures, `configure' can figure that out, but if it prints
+_same_ architectures, 'configure' can figure that out, but if it prints
 a message saying it cannot guess the machine type, give it the
-`--build=TYPE' option.  TYPE can either be a short name for the system
-type, such as `sun4', or a canonical name which has the form:
+'--build=TYPE' option.  TYPE can either be a short name for the system
+type, such as 'sun4', or a canonical name which has the form:
 
      CPU-COMPANY-SYSTEM
 
@@ -270,101 +268,101 @@ where SYSTEM can have one of these forms:
      OS
      KERNEL-OS
 
-   See the file `config.sub' for the possible values of each field.  If
-`config.sub' isn't included in this package, then this package doesn't
+   See the file 'config.sub' for the possible values of each field.  If
+'config.sub' isn't included in this package, then this package doesn't
 need to know the machine type.
 
    If you are _building_ compiler tools for cross-compiling, you should
-use the option `--target=TYPE' to select the type of system they will
+use the option '--target=TYPE' to select the type of system they will
 produce code for.
 
    If you want to _use_ a cross compiler, that generates code for a
 platform different from the build platform, you should specify the
 "host" platform (i.e., that on which the generated programs will
-eventually be run) with `--host=TYPE'.
+eventually be run) with '--host=TYPE'.
 
 Sharing Defaults
 ================
 
-   If you want to set default values for `configure' scripts to share,
-you can create a site shell script called `config.site' that gives
-default values for variables like `CC', `cache_file', and `prefix'.
-`configure' looks for `PREFIX/share/config.site' if it exists, then
-`PREFIX/etc/config.site' if it exists.  Or, you can set the
-`CONFIG_SITE' environment variable to the location of the site script.
-A warning: not all `configure' scripts look for a site script.
+   If you want to set default values for 'configure' scripts to share,
+you can create a site shell script called 'config.site' that gives
+default values for variables like 'CC', 'cache_file', and 'prefix'.
+'configure' looks for 'PREFIX/share/config.site' if it exists, then
+'PREFIX/etc/config.site' if it exists.  Or, you can set the
+'CONFIG_SITE' environment variable to the location of the site script.
+A warning: not all 'configure' scripts look for a site script.
 
 Defining Variables
 ==================
 
    Variables not defined in a site shell script can be set in the
-environment passed to `configure'.  However, some packages may run
+environment passed to 'configure'.  However, some packages may run
 configure again during the build, and the customized values of these
 variables may be lost.  In order to avoid this problem, you should set
-them in the `configure' command line, using `VAR=value'.  For example:
+them in the 'configure' command line, using 'VAR=value'.  For example:
 
      ./configure CC=/usr/local2/bin/gcc
 
-causes the specified `gcc' to be used as the C compiler (unless it is
+causes the specified 'gcc' to be used as the C compiler (unless it is
 overridden in the site shell script).
 
-Unfortunately, this technique does not work for `CONFIG_SHELL' due to
-an Autoconf limitation.  Until the limitation is lifted, you can use
-this workaround:
+Unfortunately, this technique does not work for 'CONFIG_SHELL' due to an
+Autoconf limitation.  Until the limitation is lifted, you can use this
+workaround:
 
      CONFIG_SHELL=/bin/bash ./configure CONFIG_SHELL=/bin/bash
 
-`configure' Invocation
+'configure' Invocation
 ======================
 
-   `configure' recognizes the following options to control how it
+   'configure' recognizes the following options to control how it
 operates.
 
-`--help'
-`-h'
-     Print a summary of all of the options to `configure', and exit.
+'--help'
+'-h'
+     Print a summary of all of the options to 'configure', and exit.
 
-`--help=short'
-`--help=recursive'
+'--help=short'
+'--help=recursive'
      Print a summary of the options unique to this package's
-     `configure', and exit.  The `short' variant lists options used
-     only in the top level, while the `recursive' variant lists options
-     also present in any nested packages.
+     'configure', and exit.  The 'short' variant lists options used only
+     in the top level, while the 'recursive' variant lists options also
+     present in any nested packages.
 
-`--version'
-`-V'
-     Print the version of Autoconf used to generate the `configure'
+'--version'
+'-V'
+     Print the version of Autoconf used to generate the 'configure'
      script, and exit.
 
-`--cache-file=FILE'
+'--cache-file=FILE'
      Enable the cache: use and save the results of the tests in FILE,
-     traditionally `config.cache'.  FILE defaults to `/dev/null' to
+     traditionally 'config.cache'.  FILE defaults to '/dev/null' to
      disable caching.
 
-`--config-cache'
-`-C'
-     Alias for `--cache-file=config.cache'.
+'--config-cache'
+'-C'
+     Alias for '--cache-file=config.cache'.
 
-`--quiet'
-`--silent'
-`-q'
+'--quiet'
+'--silent'
+'-q'
      Do not print messages saying which checks are being made.  To
-     suppress all normal output, redirect it to `/dev/null' (any error
+     suppress all normal output, redirect it to '/dev/null' (any error
      messages will still be shown).
 
-`--srcdir=DIR'
+'--srcdir=DIR'
      Look for the package's source code in directory DIR.  Usually
-     `configure' can determine that directory automatically.
+     'configure' can determine that directory automatically.
 
-`--prefix=DIR'
-     Use DIR as the installation prefix.  *note Installation Names::
-     for more details, including other options available for fine-tuning
-     the installation locations.
+'--prefix=DIR'
+     Use DIR as the installation prefix.  *note Installation Names:: for
+     more details, including other options available for fine-tuning the
+     installation locations.
 
-`--no-create'
-`-n'
+'--no-create'
+'-n'
      Run the configure checks, but stop before creating any output
      files.
 
-`configure' also accepts some other, not widely useful, options.  Run
-`configure --help' for more details.
+'configure' also accepts some other, not widely useful, options.  Run
+'configure --help' for more details.
diff --git a/doc/C/Makefile.am b/doc/C/Makefile.am
index c619ae148..0158edc0f 100644
--- a/doc/C/Makefile.am
+++ b/doc/C/Makefile.am
@@ -15,7 +15,7 @@ SCAN_OPTIONS=--deprecated-guards="GDA_DISABLE_DEPRECATED"
 SCANGOBJ_OPTIONS=
 
 # The directory containing the source code. Relative to $(srcdir)
-DOC_SOURCE_DIR=../..
+DOC_SOURCE_DIR=$(top_srcdir)
 
 # Add the builddir to the HTML path so that version.xml is found
 MKHTML_OPTIONS=--path="$(abs_srcdir)"
diff --git a/libgda/Gda-5.0.gir b/libgda/Gda-5.0.gir
index 60d0a1567..fdb74719a 100644
--- a/libgda/Gda-5.0.gir
+++ b/libgda/Gda-5.0.gir
@@ -77,7 +77,10 @@ and/or use gtk-doc annotations.  -->
           <instance-parameter name="mgr" transfer-ownership="none">
             <type name="AttributesManager" c:type="GdaAttributesManager*"/>
           </instance-parameter>
-          <parameter name="ptr" transfer-ownership="none">
+          <parameter name="ptr"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
         </parameters>
@@ -92,13 +95,19 @@ and/or use gtk-doc annotations.  -->
           <instance-parameter name="from_mgr" transfer-ownership="none">
             <type name="AttributesManager" c:type="GdaAttributesManager*"/>
           </instance-parameter>
-          <parameter name="from" transfer-ownership="none">
+          <parameter name="from"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer*"/>
           </parameter>
           <parameter name="to_mgr" transfer-ownership="none">
             <type name="AttributesManager" c:type="GdaAttributesManager*"/>
           </parameter>
-          <parameter name="to" transfer-ownership="none">
+          <parameter name="to"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer*"/>
           </parameter>
         </parameters>
@@ -111,14 +120,20 @@ and/or use gtk-doc annotations.  -->
           <instance-parameter name="mgr" transfer-ownership="none">
             <type name="AttributesManager" c:type="GdaAttributesManager*"/>
           </instance-parameter>
-          <parameter name="ptr" transfer-ownership="none">
+          <parameter name="ptr"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
           <parameter name="func" transfer-ownership="none" closure="2">
             <type name="AttributesManagerFunc"
                   c:type="GdaAttributesManagerFunc"/>
           </parameter>
-          <parameter name="data" transfer-ownership="none">
+          <parameter name="data"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
         </parameters>
@@ -141,7 +156,10 @@ and/or use gtk-doc annotations.  -->
           <instance-parameter name="mgr" transfer-ownership="none">
             <type name="AttributesManager" c:type="GdaAttributesManager*"/>
           </instance-parameter>
-          <parameter name="ptr" transfer-ownership="none">
+          <parameter name="ptr"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
           <parameter name="att_name" transfer-ownership="none">
@@ -157,7 +175,10 @@ and/or use gtk-doc annotations.  -->
           <instance-parameter name="mgr" transfer-ownership="none">
             <type name="AttributesManager" c:type="GdaAttributesManager*"/>
           </instance-parameter>
-          <parameter name="ptr" transfer-ownership="none">
+          <parameter name="ptr"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
           <parameter name="att_name" transfer-ownership="none">
@@ -176,7 +197,10 @@ and/or use gtk-doc annotations.  -->
           <instance-parameter name="mgr" transfer-ownership="none">
             <type name="AttributesManager" c:type="GdaAttributesManager*"/>
           </instance-parameter>
-          <parameter name="ptr" transfer-ownership="none">
+          <parameter name="ptr"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
           <parameter name="att_name" transfer-ownership="none">
@@ -204,7 +228,10 @@ and/or use gtk-doc annotations.  -->
             <type name="AttributesManagerSignal"
                   c:type="GdaAttributesManagerSignal"/>
           </parameter>
-          <parameter name="signal_data" transfer-ownership="none">
+          <parameter name="signal_data"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
         </parameters>
@@ -221,7 +248,10 @@ and/or use gtk-doc annotations.  -->
         <parameter name="value" transfer-ownership="none">
           <type name="GObject.Value" c:type="const GValue*"/>
         </parameter>
-        <parameter name="data" transfer-ownership="none">
+        <parameter name="data"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
       </parameters>
@@ -241,7 +271,10 @@ and/or use gtk-doc annotations.  -->
         <parameter name="value" transfer-ownership="none">
           <type name="GObject.Value" c:type="const GValue*"/>
         </parameter>
-        <parameter name="data" transfer-ownership="none">
+        <parameter name="data"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
       </parameters>
@@ -465,9 +498,13 @@ times in @batch's statements' list, then only the first one is removed.</doc>
             glib:get-type="gda_binary_get_type"
             c:symbol-prefix="binary">
       <field name="data" writable="1">
-        <type name="guint8" c:type="guchar*"/>
+        <doc xml:space="preserve">the actual data as an array</doc>
+        <array zero-terminated="0" c:type="guchar*">
+          <type name="guint8" c:type="guchar"/>
+        </array>
       </field>
       <field name="binary_length" writable="1">
+        <doc xml:space="preserve">length of @data</doc>
         <type name="glong" c:type="glong"/>
       </field>
       <method name="to_string" c:identifier="gda_binary_to_string">
@@ -499,14 +536,17 @@ a string for example when using g_value_transform() or gda_value_stringify().</d
       </method>
       <function name="copy" c:identifier="gda_binary_copy">
         <doc xml:space="preserve">Creates a new #GdaBinary structure from an existing one.</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">a newly allocated #GdaBinary which contains a copy of information in 
@boxed.
 
 Free-function: gda_binary_free</doc>
           <type name="gpointer" c:type="gpointer"/>
         </return-value>
         <parameters>
-          <parameter name="boxed" transfer-ownership="none">
+          <parameter name="boxed"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <doc xml:space="preserve">source to get a copy from.</doc>
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
@@ -518,7 +558,10 @@ Free-function: gda_binary_free</doc>
           <type name="none" c:type="void"/>
         </return-value>
         <parameters>
-          <parameter name="boxed" transfer-ownership="full">
+          <parameter name="boxed"
+                     transfer-ownership="full"
+                     nullable="1"
+                     allow-none="1">
             <doc xml:space="preserve">#GdaBinary to free.</doc>
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
@@ -581,14 +624,17 @@ is converted to "\\".</doc>
       </method>
       <function name="copy" c:identifier="gda_blob_copy">
         <doc xml:space="preserve">Creates a new #GdaBlob structure from an existing one.</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">a newly allocated #GdaBlob which contains a copy of information in 
@boxed.
 
 Free-function: gda_blob_free</doc>
           <type name="gpointer" c:type="gpointer"/>
         </return-value>
         <parameters>
-          <parameter name="boxed" transfer-ownership="none">
+          <parameter name="boxed"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <doc xml:space="preserve">source to get a copy from.</doc>
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
@@ -600,7 +646,10 @@ Free-function: gda_blob_free</doc>
           <type name="none" c:type="void"/>
         </return-value>
         <parameters>
-          <parameter name="boxed" transfer-ownership="full">
+          <parameter name="boxed"
+                     transfer-ownership="full"
+                     nullable="1"
+                     allow-none="1">
             <doc xml:space="preserve">#GdaBlob to free.</doc>
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
@@ -1038,7 +1087,7 @@ Attributes can have any name, but Libgda proposes some default names, see &lt;li
       </method>
       <method name="get_default_value"
               c:identifier="gda_column_get_default_value">
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">@column's default value, as a #GValue object, or %NULL if column does 
not have a default value</doc>
           <type name="GObject.Value" c:type="const GValue*"/>
         </return-value>
@@ -1658,7 +1707,10 @@ This method may fail with a %GDA_CONFIG_ERROR domain error (see the #GdaConfigEr
           <type name="none" c:type="void"/>
         </return-value>
         <parameters>
-          <parameter name="new_dsn" transfer-ownership="none">
+          <parameter name="new_dsn"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <doc xml:space="preserve">a #GdaDsnInfo</doc>
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
@@ -1670,7 +1722,10 @@ This method may fail with a %GDA_CONFIG_ERROR domain error (see the #GdaConfigEr
           <type name="none" c:type="void"/>
         </return-value>
         <parameters>
-          <parameter name="dsn" transfer-ownership="none">
+          <parameter name="dsn"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <doc xml:space="preserve">a #GdaDsnInfo</doc>
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
@@ -1682,7 +1737,10 @@ This method may fail with a %GDA_CONFIG_ERROR domain error (see the #GdaConfigEr
           <type name="none" c:type="void"/>
         </return-value>
         <parameters>
-          <parameter name="old_dsn" transfer-ownership="none">
+          <parameter name="old_dsn"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <doc xml:space="preserve">a #GdaDsnInfo</doc>
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
@@ -1694,7 +1752,10 @@ This method may fail with a %GDA_CONFIG_ERROR domain error (see the #GdaConfigEr
           <type name="none" c:type="void"/>
         </return-value>
         <parameters>
-          <parameter name="old_dsn" transfer-ownership="none">
+          <parameter name="old_dsn"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <doc xml:space="preserve">a #GdaDsnInfo</doc>
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
@@ -3036,7 +3097,7 @@ change.</doc>
               introspectable="0">
         <doc xml:space="preserve">Get the opaque pointer previously set using 
gda_connection_internal_set_provider_data().
 If it's not set, then add a connection event and returns %NULL</doc>
-        <return-value>
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">the pointer to the opaque structure set using 
gda_connection_internal_set_provider_data(), or %NULL</doc>
           <type name="gpointer" c:type="gpointer"/>
         </return-value>
@@ -3054,7 +3115,7 @@ If it's not set, then add a connection event and returns %NULL</doc>
               throws="1">
         <doc xml:space="preserve">Get the opaque pointer previously set using 
gda_connection_internal_set_provider_data().
 If it's not set, then add a connection event and returns %NULL</doc>
-        <return-value>
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">the pointer to the opaque structure set using 
gda_connection_internal_set_provider_data(), or %NULL</doc>
           <type name="gpointer" c:type="gpointer"/>
         </return-value>
@@ -3174,7 +3235,10 @@ set opaque @data, you'll have to do it yourself.</doc>
             <doc xml:space="preserve">a #GdaConnection object</doc>
             <type name="Connection" c:type="GdaConnection*"/>
           </instance-parameter>
-          <parameter name="data" transfer-ownership="none">
+          <parameter name="data"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <doc xml:space="preserve">an opaque structure, known only to the provider for which @cnc is 
opened</doc>
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
@@ -5146,7 +5210,10 @@ will speed things up as less data will be processed.</doc>
           <type name="gboolean" c:type="gboolean"/>
         </return-value>
         <parameters>
-          <parameter name="object" transfer-ownership="none">
+          <parameter name="object"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
         </parameters>
@@ -5282,7 +5349,7 @@ The returned pointer is %NULL if there is no default data handler available for
       <virtual-method name="get_sane_init_value" invoker="get_sane_init_value">
         <doc xml:space="preserve">Creates a new GValue which holds a sane initial value to be used if no 
value is specifically
 provided. For example for a simple string, this would return a new value containing the "" string.</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">the new #GValue, or %NULL if no such value can be created.</doc>
           <type name="GObject.Value" c:type="GValue*"/>
         </return-value>
@@ -5445,7 +5512,7 @@ Note: the @str string must be in the current locale representation</doc>
               c:identifier="gda_data_handler_get_sane_init_value">
         <doc xml:space="preserve">Creates a new GValue which holds a sane initial value to be used if no 
value is specifically
 provided. For example for a simple string, this would return a new value containing the "" string.</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">the new #GValue, or %NULL if no such value can be created.</doc>
           <type name="GObject.Value" c:type="GValue*"/>
         </return-value>
@@ -5678,7 +5745,7 @@ Note: the @str string must be in the current locale representation</doc>
       </field>
       <field name="get_sane_init_value">
         <callback name="get_sane_init_value">
-          <return-value transfer-ownership="full">
+          <return-value transfer-ownership="full" nullable="1">
             <doc xml:space="preserve">the new #GValue, or %NULL if no such value can be created.</doc>
             <type name="GObject.Value" c:type="GValue*"/>
           </return-value>
@@ -5848,7 +5915,7 @@ about the given column in the data model.
 
 WARNING: the returned #GdaColumn object belongs to the @model model and
 and should not be destroyed; any modification will affect the whole data model.</doc>
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">the description of the column.</doc>
           <type name="Column" c:type="GdaColumn*"/>
         </return-value>
@@ -6008,7 +6075,7 @@ gda_data_model_set_values() methods.
 
 Upon errors %NULL will be returned and @error will be assigned a
 #GError from the #GDA_DATA_MODEL_ERROR domain.</doc>
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">a #GValue containing the value stored in the given
 position, or %NULL on error (out-of-bound position, etc).</doc>
           <type name="GObject.Value" c:type="const GValue*"/>
@@ -6391,7 +6458,7 @@ Upon errors -1 will be returned and @error will be assigned a
               c:identifier="gda_data_model_array_copy_model"
               throws="1">
         <doc xml:space="preserve">Makes a copy of @src into a new #GdaDataModelArray object</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">a new data model, or %NULL if an error occurred</doc>
           <type name="DataModelArray" c:type="GdaDataModelArray*"/>
         </return-value>
@@ -6408,7 +6475,7 @@ Upon errors -1 will be returned and @error will be assigned a
               throws="1">
         <doc xml:space="preserve">Like gda_data_model_array_copy_model(), makes a copy of @src, but copies 
only some
 columns.</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">a new data model, or %NULL if an error occurred</doc>
           <type name="DataModelArray" c:type="GdaDataModelArray*"/>
         </return-value>
@@ -6473,7 +6540,7 @@ about the given column in the data model.
 
 WARNING: the returned #GdaColumn object belongs to the @model model and
 and should not be destroyed; any modification will affect the whole data model.</doc>
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">the description of the column.</doc>
           <type name="Column" c:type="GdaColumn*"/>
         </return-value>
@@ -6507,7 +6574,10 @@ The following environment variables can affect the resulting output:
             <doc xml:space="preserve">a #GdaDataModel.</doc>
             <type name="DataModel" c:type="GdaDataModel*"/>
           </instance-parameter>
-          <parameter name="to_stream" transfer-ownership="none">
+          <parameter name="to_stream"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <doc xml:space="preserve">where to dump the data model</doc>
             <type name="gpointer" c:type="FILE*"/>
           </parameter>
@@ -6886,7 +6956,7 @@ Note: the same limitations and usage instructions apply as for gda_data_model_ge
 
 Upon errors %NULL will be returned and @error will be assigned a
 #GError from the #GDA_DATA_MODEL_ERROR domain.</doc>
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">a #GValue containing the value stored in the given
 position, or %NULL on error (out-of-bound position, wrong data type, etc).</doc>
           <type name="GObject.Value" c:type="const GValue*"/>
@@ -6940,7 +7010,7 @@ gda_data_model_set_values() methods.
 
 Upon errors %NULL will be returned and @error will be assigned a
 #GError from the #GDA_DATA_MODEL_ERROR domain.</doc>
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">a #GValue containing the value stored in the given
 position, or %NULL on error (out-of-bound position, etc).</doc>
           <type name="GObject.Value" c:type="const GValue*"/>
@@ -7690,373 +7760,34 @@ Also clears @model's contents.</doc>
           <type name="none" c:type="void"/>
         </return-value>
         <parameters>
-          <instance-parameter name="model" transfer-ownership="none">
-            <doc xml:space="preserve">the #GdaDataModelArray.</doc>
-            <type name="DataModelArray" c:type="GdaDataModelArray*"/>
-          </instance-parameter>
-          <parameter name="cols" transfer-ownership="none">
-            <doc xml:space="preserve">number of columns for rows this data model should use.</doc>
-            <type name="gint" c:type="gint"/>
-          </parameter>
-        </parameters>
-      </method>
-      <property name="n-columns" writable="1" transfer-ownership="none">
-        <type name="guint" c:type="guint"/>
-      </property>
-      <property name="read-only" writable="1" transfer-ownership="none">
-        <type name="gboolean" c:type="gboolean"/>
-      </property>
-      <field name="object">
-        <type name="GObject.Object" c:type="GObject"/>
-      </field>
-      <field name="priv">
-        <type name="DataModelArrayPrivate" c:type="GdaDataModelArrayPrivate*"/>
-      </field>
-    </class>
-    <record name="DataModelArrayClass"
-            c:type="GdaDataModelArrayClass"
-            glib:is-gtype-struct-for="DataModelArray">
-      <field name="parent_class">
-        <type name="GObject.ObjectClass" c:type="GObjectClass"/>
-      </field>
-      <field name="_gda_reserved1" introspectable="0">
-        <callback name="_gda_reserved1">
-          <return-value transfer-ownership="none">
-            <type name="none" c:type="void"/>
-          </return-value>
-        </callback>
-      </field>
-      <field name="_gda_reserved2" introspectable="0">
-        <callback name="_gda_reserved2">
-          <return-value transfer-ownership="none">
-            <type name="none" c:type="void"/>
-          </return-value>
-        </callback>
-      </field>
-      <field name="_gda_reserved3" introspectable="0">
-        <callback name="_gda_reserved3">
-          <return-value transfer-ownership="none">
-            <type name="none" c:type="void"/>
-          </return-value>
-        </callback>
-      </field>
-      <field name="_gda_reserved4" introspectable="0">
-        <callback name="_gda_reserved4">
-          <return-value transfer-ownership="none">
-            <type name="none" c:type="void"/>
-          </return-value>
-        </callback>
-      </field>
-    </record>
-    <record name="DataModelArrayPrivate"
-            c:type="GdaDataModelArrayPrivate"
-            disguised="1">
-    </record>
-    <class name="DataModelBdb"
-           c:symbol-prefix="data_model_bdb"
-           c:type="GdaDataModelBdb"
-           parent="GObject.Object"
-           glib:type-name="GdaDataModelBdb"
-           glib:get-type="gda_data_model_bdb_get_type"
-           glib:type-struct="DataModelBdbClass">
-      <implements name="DataModel"/>
-      <function name="new" c:identifier="gda_data_model_bdb_new">
-        <doc xml:space="preserve">Creates a new #GdaDataModel object to access the contents of the Berkeley 
DB file @file,
-for the database @db_name if not %NULL</doc>
-        <return-value transfer-ownership="full">
-          <doc xml:space="preserve">a new #GdaDataModel</doc>
-          <type name="DataModel" c:type="GdaDataModel*"/>
-        </return-value>
-        <parameters>
-          <parameter name="filename" transfer-ownership="none">
-            <doc xml:space="preserve">name of the file containing the database</doc>
-            <type name="utf8" c:type="const gchar*"/>
-          </parameter>
-          <parameter name="db_name"
-                     transfer-ownership="none"
-                     nullable="1"
-                     allow-none="1">
-            <doc xml:space="preserve">the name of the database within @filename, or %NULL</doc>
-            <type name="utf8" c:type="const gchar*"/>
-          </parameter>
-        </parameters>
-      </function>
-      <virtual-method name="create_data_columns" introspectable="0">
-        <return-value>
-          <type name="GLib.SList" c:type="GSList*">
-            <type name="gpointer" c:type="gpointer"/>
-          </type>
-        </return-value>
-        <parameters>
-          <instance-parameter name="model" transfer-ownership="none">
-            <type name="DataModelBdb" c:type="GdaDataModelBdb*"/>
-          </instance-parameter>
-        </parameters>
-      </virtual-method>
-      <virtual-method name="create_key_columns" introspectable="0">
-        <return-value>
-          <type name="GLib.SList" c:type="GSList*">
-            <type name="gpointer" c:type="gpointer"/>
-          </type>
-        </return-value>
-        <parameters>
-          <instance-parameter name="model" transfer-ownership="none">
-            <type name="DataModelBdb" c:type="GdaDataModelBdb*"/>
-          </instance-parameter>
-        </parameters>
-      </virtual-method>
-      <virtual-method name="get_data_part">
-        <return-value transfer-ownership="full">
-          <type name="GObject.Value" c:type="GValue*"/>
-        </return-value>
-        <parameters>
-          <instance-parameter name="model" transfer-ownership="none">
-            <type name="DataModelBdb" c:type="GdaDataModelBdb*"/>
-          </instance-parameter>
-          <parameter name="data" transfer-ownership="none">
-            <type name="gpointer" c:type="gpointer"/>
-          </parameter>
-          <parameter name="length" transfer-ownership="none">
-            <type name="gint" c:type="gint"/>
-          </parameter>
-          <parameter name="part" transfer-ownership="none">
-            <type name="gint" c:type="gint"/>
-          </parameter>
-        </parameters>
-      </virtual-method>
-      <virtual-method name="get_key_part">
-        <return-value transfer-ownership="full">
-          <type name="GObject.Value" c:type="GValue*"/>
-        </return-value>
-        <parameters>
-          <instance-parameter name="model" transfer-ownership="none">
-            <type name="DataModelBdb" c:type="GdaDataModelBdb*"/>
-          </instance-parameter>
-          <parameter name="data" transfer-ownership="none">
-            <type name="gpointer" c:type="gpointer"/>
-          </parameter>
-          <parameter name="length" transfer-ownership="none">
-            <type name="gint" c:type="gint"/>
-          </parameter>
-          <parameter name="part" transfer-ownership="none">
-            <type name="gint" c:type="gint"/>
-          </parameter>
-        </parameters>
-      </virtual-method>
-      <virtual-method name="update_data_part" throws="1">
-        <return-value transfer-ownership="none">
-          <type name="gboolean" c:type="gboolean"/>
-        </return-value>
-        <parameters>
-          <instance-parameter name="model" transfer-ownership="none">
-            <type name="DataModelBdb" c:type="GdaDataModelBdb*"/>
-          </instance-parameter>
-          <parameter name="data" transfer-ownership="none">
-            <type name="gpointer" c:type="gpointer"/>
-          </parameter>
-          <parameter name="length" transfer-ownership="none">
-            <type name="gint" c:type="gint"/>
-          </parameter>
-          <parameter name="part" transfer-ownership="none">
-            <type name="gint" c:type="gint"/>
-          </parameter>
-          <parameter name="value" transfer-ownership="none">
-            <type name="GObject.Value" c:type="const GValue*"/>
-          </parameter>
-        </parameters>
-      </virtual-method>
-      <virtual-method name="update_key_part" throws="1">
-        <return-value transfer-ownership="none">
-          <type name="gboolean" c:type="gboolean"/>
-        </return-value>
-        <parameters>
-          <instance-parameter name="model" transfer-ownership="none">
-            <type name="DataModelBdb" c:type="GdaDataModelBdb*"/>
-          </instance-parameter>
-          <parameter name="data" transfer-ownership="none">
-            <type name="gpointer" c:type="gpointer"/>
-          </parameter>
-          <parameter name="length" transfer-ownership="none">
-            <type name="gint" c:type="gint"/>
-          </parameter>
-          <parameter name="part" transfer-ownership="none">
-            <type name="gint" c:type="gint"/>
-          </parameter>
-          <parameter name="value" transfer-ownership="none">
-            <type name="GObject.Value" c:type="const GValue*"/>
-          </parameter>
-        </parameters>
-      </virtual-method>
-      <method name="clean_errors"
-              c:identifier="gda_data_model_bdb_clean_errors">
-        <doc xml:space="preserve">Reset the list of errors which have occurred while using @model</doc>
-        <return-value transfer-ownership="none">
-          <type name="none" c:type="void"/>
-        </return-value>
-        <parameters>
-          <instance-parameter name="model" transfer-ownership="none">
-            <doc xml:space="preserve">a #GdaDataModelBdb object</doc>
-            <type name="DataModelBdb" c:type="GdaDataModelBdb*"/>
-          </instance-parameter>
-        </parameters>
-      </method>
-      <method name="get_errors" c:identifier="gda_data_model_bdb_get_errors">
-        <doc xml:space="preserve">Get the list of errors which have occurred while using @model</doc>
-        <return-value transfer-ownership="none">
-          <doc xml:space="preserve">a read-only list of #GError pointers, or %NULL if no error has 
occurred</doc>
-          <type name="GLib.SList" c:type="const GSList*">
-            <type name="GLib.Error"/>
-          </type>
-        </return-value>
-        <parameters>
-          <instance-parameter name="model" transfer-ownership="none">
-            <doc xml:space="preserve">a #GdaDataModelBdb object</doc>
-            <type name="DataModelBdb" c:type="GdaDataModelBdb*"/>
-          </instance-parameter>
-        </parameters>
-      </method>
-      <property name="db-name"
-                writable="1"
-                construct-only="1"
-                transfer-ownership="none">
-        <type name="utf8" c:type="gchar*"/>
-      </property>
-      <property name="filename"
-                writable="1"
-                construct-only="1"
-                transfer-ownership="none">
-        <type name="utf8" c:type="gchar*"/>
-      </property>
-      <field name="object">
-        <type name="GObject.Object" c:type="GObject"/>
-      </field>
-      <field name="priv">
-        <type name="DataModelBdbPrivate" c:type="GdaDataModelBdbPrivate*"/>
-      </field>
-    </class>
-    <record name="DataModelBdbClass"
-            c:type="GdaDataModelBdbClass"
-            glib:is-gtype-struct-for="DataModelBdb">
-      <field name="parent_class">
-        <type name="GObject.ObjectClass" c:type="GObjectClass"/>
-      </field>
-      <field name="create_key_columns" introspectable="0">
-        <callback name="create_key_columns" introspectable="0">
-          <return-value>
-            <type name="GLib.SList" c:type="GSList*">
-              <type name="gpointer" c:type="gpointer"/>
-            </type>
-          </return-value>
-          <parameters>
-            <parameter name="model" transfer-ownership="none">
-              <type name="DataModelBdb" c:type="GdaDataModelBdb*"/>
-            </parameter>
-          </parameters>
-        </callback>
-      </field>
-      <field name="create_data_columns" introspectable="0">
-        <callback name="create_data_columns" introspectable="0">
-          <return-value>
-            <type name="GLib.SList" c:type="GSList*">
-              <type name="gpointer" c:type="gpointer"/>
-            </type>
-          </return-value>
-          <parameters>
-            <parameter name="model" transfer-ownership="none">
-              <type name="DataModelBdb" c:type="GdaDataModelBdb*"/>
-            </parameter>
-          </parameters>
-        </callback>
-      </field>
-      <field name="get_key_part">
-        <callback name="get_key_part">
-          <return-value transfer-ownership="full">
-            <type name="GObject.Value" c:type="GValue*"/>
-          </return-value>
-          <parameters>
-            <parameter name="model" transfer-ownership="none">
-              <type name="DataModelBdb" c:type="GdaDataModelBdb*"/>
-            </parameter>
-            <parameter name="data" transfer-ownership="none">
-              <type name="gpointer" c:type="gpointer"/>
-            </parameter>
-            <parameter name="length" transfer-ownership="none">
-              <type name="gint" c:type="gint"/>
-            </parameter>
-            <parameter name="part" transfer-ownership="none">
-              <type name="gint" c:type="gint"/>
-            </parameter>
-          </parameters>
-        </callback>
-      </field>
-      <field name="get_data_part">
-        <callback name="get_data_part">
-          <return-value transfer-ownership="full">
-            <type name="GObject.Value" c:type="GValue*"/>
-          </return-value>
-          <parameters>
-            <parameter name="model" transfer-ownership="none">
-              <type name="DataModelBdb" c:type="GdaDataModelBdb*"/>
-            </parameter>
-            <parameter name="data" transfer-ownership="none">
-              <type name="gpointer" c:type="gpointer"/>
-            </parameter>
-            <parameter name="length" transfer-ownership="none">
-              <type name="gint" c:type="gint"/>
-            </parameter>
-            <parameter name="part" transfer-ownership="none">
-              <type name="gint" c:type="gint"/>
-            </parameter>
-          </parameters>
-        </callback>
+          <instance-parameter name="model" transfer-ownership="none">
+            <doc xml:space="preserve">the #GdaDataModelArray.</doc>
+            <type name="DataModelArray" c:type="GdaDataModelArray*"/>
+          </instance-parameter>
+          <parameter name="cols" transfer-ownership="none">
+            <doc xml:space="preserve">number of columns for rows this data model should use.</doc>
+            <type name="gint" c:type="gint"/>
+          </parameter>
+        </parameters>
+      </method>
+      <property name="n-columns" writable="1" transfer-ownership="none">
+        <type name="guint" c:type="guint"/>
+      </property>
+      <property name="read-only" writable="1" transfer-ownership="none">
+        <type name="gboolean" c:type="gboolean"/>
+      </property>
+      <field name="object">
+        <type name="GObject.Object" c:type="GObject"/>
       </field>
-      <field name="update_key_part">
-        <callback name="update_key_part" throws="1">
-          <return-value transfer-ownership="none">
-            <type name="gboolean" c:type="gboolean"/>
-          </return-value>
-          <parameters>
-            <parameter name="model" transfer-ownership="none">
-              <type name="DataModelBdb" c:type="GdaDataModelBdb*"/>
-            </parameter>
-            <parameter name="data" transfer-ownership="none">
-              <type name="gpointer" c:type="gpointer"/>
-            </parameter>
-            <parameter name="length" transfer-ownership="none">
-              <type name="gint" c:type="gint"/>
-            </parameter>
-            <parameter name="part" transfer-ownership="none">
-              <type name="gint" c:type="gint"/>
-            </parameter>
-            <parameter name="value" transfer-ownership="none">
-              <type name="GObject.Value" c:type="const GValue*"/>
-            </parameter>
-          </parameters>
-        </callback>
+      <field name="priv">
+        <type name="DataModelArrayPrivate" c:type="GdaDataModelArrayPrivate*"/>
       </field>
-      <field name="update_data_part">
-        <callback name="update_data_part" throws="1">
-          <return-value transfer-ownership="none">
-            <type name="gboolean" c:type="gboolean"/>
-          </return-value>
-          <parameters>
-            <parameter name="model" transfer-ownership="none">
-              <type name="DataModelBdb" c:type="GdaDataModelBdb*"/>
-            </parameter>
-            <parameter name="data" transfer-ownership="none">
-              <type name="gpointer" c:type="gpointer"/>
-            </parameter>
-            <parameter name="length" transfer-ownership="none">
-              <type name="gint" c:type="gint"/>
-            </parameter>
-            <parameter name="part" transfer-ownership="none">
-              <type name="gint" c:type="gint"/>
-            </parameter>
-            <parameter name="value" transfer-ownership="none">
-              <type name="GObject.Value" c:type="const GValue*"/>
-            </parameter>
-          </parameters>
-        </callback>
+    </class>
+    <record name="DataModelArrayClass"
+            c:type="GdaDataModelArrayClass"
+            glib:is-gtype-struct-for="DataModelArray">
+      <field name="parent_class">
+        <type name="GObject.ObjectClass" c:type="GObjectClass"/>
       </field>
       <field name="_gda_reserved1" introspectable="0">
         <callback name="_gda_reserved1">
@@ -8087,8 +7818,8 @@ for the database @db_name if not %NULL</doc>
         </callback>
       </field>
     </record>
-    <record name="DataModelBdbPrivate"
-            c:type="GdaDataModelBdbPrivate"
+    <record name="DataModelArrayPrivate"
+            c:type="GdaDataModelArrayPrivate"
             disguised="1">
     </record>
     <class name="DataModelDir"
@@ -8308,7 +8039,7 @@ for the database @db_name if not %NULL</doc>
       </field>
       <field name="i_describe_column">
         <callback name="i_describe_column">
-          <return-value transfer-ownership="none">
+          <return-value transfer-ownership="none" nullable="1">
             <doc xml:space="preserve">the description of the column.</doc>
             <type name="Column" c:type="GdaColumn*"/>
           </return-value>
@@ -8341,7 +8072,7 @@ for the database @db_name if not %NULL</doc>
       </field>
       <field name="i_get_value_at">
         <callback name="i_get_value_at" throws="1">
-          <return-value transfer-ownership="none">
+          <return-value transfer-ownership="none" nullable="1">
             <doc xml:space="preserve">a #GValue containing the value stored in the given
 position, or %NULL on error (out-of-bound position, etc).</doc>
             <type name="GObject.Value" c:type="const GValue*"/>
@@ -9079,7 +8810,7 @@ column @col</doc>
       <method name="get_value_at"
               c:identifier="gda_data_model_iter_get_value_at">
         <doc xml:space="preserve">Get the value stored at the column @col in @iter. The returned value must 
not be modified.</doc>
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">the #GValue, or %NULL if the value could not be fetched</doc>
           <type name="GObject.Value" c:type="const GValue*"/>
         </return-value>
@@ -9099,7 +8830,7 @@ column @col</doc>
               version="4.2.10"
               throws="1">
         <doc xml:space="preserve">Get the value stored at the column @col in @iter. The returned value must 
not be modified.</doc>
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">the #GValue, or %NULL if the value could not be fetched</doc>
           <type name="GObject.Value" c:type="const GValue*"/>
         </return-value>
@@ -9117,7 +8848,7 @@ column @col</doc>
       <method name="get_value_for_field"
               c:identifier="gda_data_model_iter_get_value_for_field">
         <doc xml:space="preserve">Get the value stored at the column @field_name in @iter</doc>
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">the #GValue, or %NULL</doc>
           <type name="GObject.Value" c:type="const GValue*"/>
         </return-value>
@@ -9554,11 +9285,10 @@ gda_data_model_iter_get_value_at() will return %NULL when using an iterator.</do
         <type name="utf8" c:type="gchar*"/>
       </property>
       <property name="cnc"
-                introspectable="0"
                 writable="1"
                 construct-only="1"
                 transfer-ownership="none">
-        <type/>
+        <type name="Connection"/>
       </property>
       <property name="filter"
                 writable="1"
@@ -9572,9 +9302,6 @@ gda_data_model_iter_get_value_at() will return %NULL when using an iterator.</do
                 transfer-ownership="none">
         <type name="gint" c:type="gint"/>
       </property>
-      <property name="use-rdn" writable="1" transfer-ownership="none">
-        <type name="gboolean" c:type="gboolean"/>
-      </property>
       <field name="object">
         <type name="GObject.Object" c:type="GObject"/>
       </field>
@@ -11565,11 +11292,14 @@ occurrence of "'" with "''" and "\" with "\\"</doc>
         <type name="gdouble" c:type="gdouble"/>
       </field>
       <function name="copy" c:identifier="gda_geometricpoint_copy">
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <type name="gpointer" c:type="gpointer"/>
         </return-value>
         <parameters>
-          <parameter name="boxed" transfer-ownership="none">
+          <parameter name="boxed"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
         </parameters>
@@ -11579,7 +11309,10 @@ occurrence of "'" with "''" and "\" with "\\"</doc>
           <type name="none" c:type="void"/>
         </return-value>
         <parameters>
-          <parameter name="boxed" transfer-ownership="none">
+          <parameter name="boxed"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
         </parameters>
@@ -12299,7 +12032,7 @@ and that default value is not of the same type as @holder, then %NULL is returne
 If @holder is set to NULL, then the returned value is a #GDA_TYPE_NULL GValue.
 
 If @holder is invalid, then the returned value is %NULL.</doc>
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">the value, or %NULL</doc>
           <type name="GObject.Value" c:type="const GValue*"/>
         </return-value>
@@ -14866,7 +14599,10 @@ uses a function which is not natively provided by SQLite.</doc>
             <type name="AttributesManagerFunc"
                   c:type="GdaAttributesManagerFunc"/>
           </parameter>
-          <parameter name="data" transfer-ownership="none">
+          <parameter name="data"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <doc xml:space="preserve">user data to be passed as last argument of @func each time it is 
called</doc>
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
@@ -15113,7 +14849,7 @@ Free-function: gda_numeric_free</doc>
               c:identifier="gda_numeric_get_string"
               version="5.0.2">
         <doc xml:space="preserve">Get the string representation of @numeric, in the C locale format (dot as 
a fraction separator).</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">a new string representing the stored valued in @numeric</doc>
           <type name="utf8" c:type="gchar*"/>
         </return-value>
@@ -15513,7 +15249,10 @@ of each pair, and the given user_data parameter. @qlist may not be modified whil
             <doc xml:space="preserve">the function to call for each key/value pair</doc>
             <type name="GLib.HFunc" c:type="GHFunc"/>
           </parameter>
-          <parameter name="user_data" transfer-ownership="none">
+          <parameter name="user_data"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <doc xml:space="preserve">user data to pass to the function</doc>
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
@@ -15707,7 +15446,7 @@ Use this object with gda_repetitive_statement_append_set().</doc>
 
 This is a pointer to the internal array of values. Don't try to free
 or modify it (modifying is reserved to database provider's implementations).</doc>
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">a pointer to the #GValue in the position @num of @row.</doc>
           <type name="GObject.Value" c:type="GValue*"/>
         </return-value>
@@ -15933,7 +15672,7 @@ gda_server_operation_perform_create_database() to perform the database creation.
 
 If @db_name is left %NULL, then the name of the database to create will have to be set in the
 returned #GdaServerOperation using gda_server_operation_set_value_at().</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">new #GdaServerOperation object, or %NULL if the provider does not 
support database
 creation</doc>
           <type name="ServerOperation" c:type="GdaServerOperation*"/>
@@ -15977,7 +15716,7 @@ flag, you need to finish the list using %NULL.
 You'll be able to modify the #GdaServerOperation object to add custom options * to the operation. When 
finished call #gda_server_operation_perform_create_table
 or #gda_server_provider_perform_operation
 in order to execute the operation.</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">a #GdaServerOperation if no errors; NULL and set @error otherwise</doc>
           <type name="ServerOperation" c:type="GdaServerOperation*"/>
         </return-value>
@@ -16011,7 +15750,7 @@ gda_server_operation_perform_drop_database() to perform the database creation.
 
 If @db_name is left %NULL, then the name of the database to drop will have to be set in the
 returned #GdaServerOperation using gda_server_operation_set_value_at().</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">new #GdaServerOperation object, or %NULL if the provider does not 
support database
 destruction</doc>
           <type name="ServerOperation" c:type="GdaServerOperation*"/>
@@ -16036,7 +15775,7 @@ destruction</doc>
                 throws="1">
         <doc xml:space="preserve">This is just a convenient function to create a #GdaServerOperation to drop 
a
 table in an opened connection.</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">a new #GdaServerOperation or %NULL if couldn't create the 
opereration.</doc>
           <type name="ServerOperation" c:type="GdaServerOperation*"/>
         </return-value>
@@ -16139,7 +15878,7 @@ of a #GdaServerOperationType</doc>
               introspectable="0">
         <doc xml:space="preserve">Get information about the node identified by @path. The returned 
#GdaServerOperationNode structure can be
 copied but not modified; it may change or cease to exist if @op changes</doc>
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">a #GdaServerOperationNode structure, or %NULL if the node was not 
found</doc>
           <type name="ServerOperationNode" c:type="GdaServerOperationNode*"/>
         </return-value>
@@ -16454,7 +16193,7 @@ if the @path is not defined or @path does not hold any value.</doc>
               shadows="get_value_at"
               version="4.2.6">
         <doc xml:space="preserve">Get the value for the node at the @path path</doc>
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">a constant #GValue if a value has been defined, or %NULL if the value is 
undefined or if the @path is not defined or @path does not hold any value.</doc>
           <type name="GObject.Value" c:type="const GValue*"/>
         </return-value>
@@ -17195,7 +16934,7 @@ action. The @options can contain:
  &lt;listitem&gt;named values which ID is a path in the resulting GdaServerOperation object, to initialize 
some value&lt;/listitem&gt;
  &lt;listitem&gt;named values which may change the contents of the GdaServerOperation, see &lt;link 
linkend="gda-server-op-information-std"&gt;this section&lt;/link&gt; for more information&lt;/listitem&gt;
 &lt;/itemizedlist&gt;</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">a new #GdaServerOperation object, or %NULL in the provider does not 
support the @type type of operation or if an error occurred</doc>
           <type name="ServerOperation" c:type="GdaServerOperation*"/>
         </return-value>
@@ -17452,7 +17191,10 @@ to be enclosed in single quotes before being used in an SQL statement.</doc>
             <type name="ServerProviderAsyncCallback"
                   c:type="GdaServerProviderAsyncCallback"/>
           </parameter>
-          <parameter name="cb_data" transfer-ownership="none">
+          <parameter name="cb_data"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
         </parameters>
@@ -17478,7 +17220,10 @@ to be enclosed in single quotes before being used in an SQL statement.</doc>
             <type name="ServerProviderAsyncCallback"
                   c:type="GdaServerProviderAsyncCallback"/>
           </parameter>
-          <parameter name="cb_data" transfer-ownership="none">
+          <parameter name="cb_data"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
         </parameters>
@@ -17491,7 +17236,7 @@ to be enclosed in single quotes before being used in an SQL statement.</doc>
 
 This function's purpose is mainly informative to get the actual SQL code which would be executed to perform
 the operation; to actually perform the operation, use gda_server_provider_perform_operation().</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">a new string, or %NULL if an error occurred or operation cannot be 
rendered as SQL.</doc>
           <type name="utf8" c:type="gchar*"/>
         </return-value>
@@ -17578,7 +17323,10 @@ the operation; to actually perform the operation, use gda_server_provider_perfor
             <type name="ServerProviderExecCallback"
                   c:type="GdaServerProviderExecCallback"/>
           </parameter>
-          <parameter name="cb_data" transfer-ownership="none">
+          <parameter name="cb_data"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
         </parameters>
@@ -17734,7 +17482,7 @@ action. The @options can contain:
  &lt;listitem&gt;named values which ID is a path in the resulting GdaServerOperation object, to initialize 
some value&lt;/listitem&gt;
  &lt;listitem&gt;named values which may change the contents of the GdaServerOperation, see &lt;link 
linkend="gda-server-op-information-std"&gt;this section&lt;/link&gt; for more information&lt;/listitem&gt;
 &lt;/itemizedlist&gt;</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">a new #GdaServerOperation object, or %NULL in the provider does not 
support the @type type of operation or if an error occurred</doc>
           <type name="ServerOperation" c:type="GdaServerOperation*"/>
         </return-value>
@@ -17927,7 +17675,7 @@ Note: this function is currently very poorly implemented by database providers.<
 The returned value may be %NULL either if the provider does not implement that method, or if
 there is no DBMS data type which could contain data of the @g_type type (for example %NULL may be
 returned if a DBMS has integers only up to 4 bytes and a #G_TYPE_INT64 is requested).</doc>
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">the name of the DBMS type, or %NULL</doc>
           <type name="utf8" c:type="const gchar*"/>
         </return-value>
@@ -18148,7 +17896,7 @@ and can be reused.</doc>
 
 This function's purpose is mainly informative to get the actual SQL code which would be executed to perform
 the operation; to actually perform the operation, use gda_server_provider_perform_operation().</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">a new string, or %NULL if an error occurred or operation cannot be 
rendered as SQL.</doc>
           <type name="utf8" c:type="gchar*"/>
         </return-value>
@@ -18356,7 +18104,10 @@ otherwise.</doc>
         <parameter name="error" transfer-ownership="none">
           <type name="GLib.Error" c:type="const GError*"/>
         </parameter>
-        <parameter name="data" transfer-ownership="none">
+        <parameter name="data"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
       </parameters>
@@ -18555,7 +18306,10 @@ otherwise.</doc>
               <type name="ServerProviderAsyncCallback"
                     c:type="GdaServerProviderAsyncCallback"/>
             </parameter>
-            <parameter name="cb_data" transfer-ownership="none">
+            <parameter name="cb_data"
+                       transfer-ownership="none"
+                       nullable="1"
+                       allow-none="1">
               <type name="gpointer" c:type="gpointer"/>
             </parameter>
           </parameters>
@@ -18626,7 +18380,7 @@ otherwise.</doc>
       </field>
       <field name="create_operation">
         <callback name="create_operation" throws="1">
-          <return-value transfer-ownership="full">
+          <return-value transfer-ownership="full" nullable="1">
             <doc xml:space="preserve">a new #GdaServerOperation object, or %NULL in the provider does not 
support the @type type of operation or if an error occurred</doc>
             <type name="ServerOperation" c:type="GdaServerOperation*"/>
           </return-value>
@@ -18659,7 +18413,7 @@ otherwise.</doc>
       </field>
       <field name="render_operation">
         <callback name="render_operation" throws="1">
-          <return-value transfer-ownership="full">
+          <return-value transfer-ownership="full" nullable="1">
             <doc xml:space="preserve">a new string, or %NULL if an error occurred or operation cannot be 
rendered as SQL.</doc>
             <type name="utf8" c:type="gchar*"/>
           </return-value>
@@ -18704,7 +18458,10 @@ otherwise.</doc>
               <type name="ServerProviderAsyncCallback"
                     c:type="GdaServerProviderAsyncCallback"/>
             </parameter>
-            <parameter name="cb_data" transfer-ownership="none">
+            <parameter name="cb_data"
+                       transfer-ownership="none"
+                       nullable="1"
+                       allow-none="1">
               <type name="gpointer" c:type="gpointer"/>
             </parameter>
           </parameters>
@@ -18925,7 +18682,10 @@ otherwise.</doc>
               <type name="ServerProviderExecCallback"
                     c:type="GdaServerProviderExecCallback"/>
             </parameter>
-            <parameter name="cb_data" transfer-ownership="none">
+            <parameter name="cb_data"
+                       transfer-ownership="none"
+                       nullable="1"
+                       allow-none="1">
               <type name="gpointer" c:type="gpointer"/>
             </parameter>
           </parameters>
@@ -19165,7 +18925,10 @@ otherwise.</doc>
         <parameter name="error" transfer-ownership="none">
           <type name="GLib.Error" c:type="const GError*"/>
         </parameter>
-        <parameter name="data" transfer-ownership="none">
+        <parameter name="data"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
       </parameters>
@@ -20898,7 +20661,7 @@ don't modify the returned structure.</doc>
       </method>
       <method name="get_holder_value" c:identifier="gda_set_get_holder_value">
         <doc xml:space="preserve">Get the value of the #GdaHolder which ID is @holder_id</doc>
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">the requested GValue, or %NULL (see gda_holder_get_value())</doc>
           <type name="GObject.Value" c:type="const GValue*"/>
         </return-value>
@@ -21204,7 +20967,10 @@ it was #GDA_TYPE_NULL</doc>
           <type name="none" c:type="void"/>
         </return-value>
         <parameters>
-          <parameter name="source" transfer-ownership="none">
+          <parameter name="source"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <doc xml:space="preserve">the #GdaSetSource for which the @data_model attribute has changed</doc>
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
@@ -21929,7 +21695,10 @@ its type and its parent in the structure hierarchy.</doc>
           <parameter name="func" transfer-ownership="none" closure="1">
             <type name="SqlForeachFunc" c:type="GdaSqlForeachFunc"/>
           </parameter>
-          <parameter name="data" transfer-ownership="none">
+          <parameter name="data"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
         </parameters>
@@ -22183,8 +21952,7 @@ expression IDs are taken from the @when_array and @then_array at the same index,
       </method>
       <method name="add_cond_v"
               c:identifier="gda_sql_builder_add_cond_v"
-              version="4.2"
-              introspectable="0">
+              version="4.2">
         <doc xml:space="preserve">Builds a new expression which represents a condition (or operation).
 
 As a side case, if @ops_ids_size is 1,
@@ -22671,7 +22439,7 @@ needed anymore. If the part with @id as ID cannot be found, the returned value i
 
 The returned pointer belongs to @builder's internal representation.
 Use gda_sql_statement_copy() if you need to keep it.</doc>
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">a #GdaSqlStatement pointer</doc>
           <type name="SqlStatement" c:type="GdaSqlStatement*"/>
         </return-value>
@@ -22747,7 +22515,6 @@ Use gda_sql_statement_copy() if you need to keep it.</doc>
         <doc xml:space="preserve">Alter a join in a SELECT statement to make its condition use equal field
 values in the fields named @field_name in both tables, via the USING keyword.</doc>
         <return-value transfer-ownership="none">
-          <doc xml:space="preserve">the ID of the new join, or %0 if there was an error</doc>
           <type name="none" c:type="void"/>
         </return-value>
         <parameters>
@@ -23427,7 +23194,10 @@ This structure represents the name of a table's field.</doc>
           <doc xml:space="preserve">the current #GdaSqlAnyPart node</doc>
           <type name="SqlAnyPart" c:type="GdaSqlAnyPart*"/>
         </parameter>
-        <parameter name="data" transfer-ownership="none">
+        <parameter name="data"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <doc xml:space="preserve">user data passed to gda_sql_any_part_foreach().</doc>
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
@@ -23772,7 +23542,7 @@ This structure represents the name of a table's field.</doc>
 at some point, then the parsing stops, @error may be set and %NULL is returned
 
 if @sql is %NULL, then the returned #GdaBatch object will contain no statement.</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">a new #GdaBatch object, or %NULL if an error occurred</doc>
           <type name="Batch" c:type="GdaBatch*"/>
         </return-value>
@@ -23796,7 +23566,7 @@ not %NULL) will point at the first non parsed character.
 
 To include variables in the @sql string, see the
 &lt;link linkend="GdaSqlParser.description"&gt;GdaSqlParser's object description&lt;/link&gt;.</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">a new #GdaStatement object, or %NULL if an error occurred</doc>
           <type name="Statement" c:type="GdaStatement*"/>
         </return-value>
@@ -23834,7 +23604,7 @@ if @sql is %NULL, then the returned #GdaBatch object will contain no statement.
 
 To include variables in the @sql string, see the
 &lt;link linkend="GdaSqlParser.description"&gt;GdaSqlParser's object description&lt;/link&gt;.</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <doc xml:space="preserve">a new #GdaBatch object, or %NULL if an error occurred</doc>
           <type name="Batch" c:type="GdaBatch*"/>
         </return-value>
@@ -23913,9 +23683,9 @@ To include variables in the @sql string, see the
       <field name="parent_class">
         <type name="GObject.ObjectClass" c:type="GObjectClass"/>
       </field>
-      <field name="delim_alloc" introspectable="0">
-        <callback name="delim_alloc" introspectable="0">
-          <return-value>
+      <field name="delim_alloc">
+        <callback name="delim_alloc">
+          <return-value transfer-ownership="none">
             <type name="gpointer" c:type="void*"/>
           </return-value>
           <parameters>
@@ -23979,9 +23749,9 @@ To include variables in the @sql string, see the
       <field name="delim_tokens_trans">
         <type name="gint" c:type="gint*"/>
       </field>
-      <field name="parser_alloc" introspectable="0">
-        <callback name="parser_alloc" introspectable="0">
-          <return-value>
+      <field name="parser_alloc">
+        <callback name="parser_alloc">
+          <return-value transfer-ownership="none">
             <type name="gpointer" c:type="void*"/>
           </return-value>
           <parameters>
@@ -25060,7 +24830,7 @@ set the value of @expr-&gt;value instead.</doc>
       </field>
       <field name="construct">
         <callback name="construct">
-          <return-value>
+          <return-value transfer-ownership="none">
             <type name="gpointer" c:type="gpointer"/>
           </return-value>
         </callback>
@@ -25079,7 +24849,7 @@ set the value of @expr-&gt;value instead.</doc>
       </field>
       <field name="copy">
         <callback name="copy">
-          <return-value>
+          <return-value transfer-ownership="none">
             <type name="gpointer" c:type="gpointer"/>
           </return-value>
           <parameters>
@@ -25923,7 +25693,10 @@ gda_thread_wrapper_disconnect() method.</doc>
             <doc xml:space="preserve">a #GdaThreadWrapper object</doc>
             <type name="ThreadWrapper" c:type="GdaThreadWrapper*"/>
           </instance-parameter>
-          <parameter name="instance" transfer-ownership="none">
+          <parameter name="instance"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <doc xml:space="preserve">the instance to connect to</doc>
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
@@ -25954,7 +25727,10 @@ gda_thread_wrapper_disconnect() method.</doc>
             <type name="ThreadWrapperCallback"
                   c:type="GdaThreadWrapperCallback"/>
           </parameter>
-          <parameter name="data" transfer-ownership="none">
+          <parameter name="data"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <doc xml:space="preserve">data to pass to @callback's calls</doc>
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
@@ -25985,7 +25761,6 @@ thread and this signal has not been handled in the user thread).</doc>
       <method name="execute"
               c:identifier="gda_thread_wrapper_execute"
               version="4.2"
-              introspectable="0"
               throws="1">
         <doc xml:space="preserve">Make @wrapper execute the @func function with the @arg argument (along 
with a #GError which is not @error)
 in the sub thread managed by @wrapper. To execute a function which does not return anything,
@@ -26088,7 +25863,7 @@ If an error occurred in this function, then the @arg_destroy_func function is no
               throws="1">
         <doc xml:space="preserve">Use this method to check if the execution of a function is finished. The 
function's execution must have
 been requested using gda_thread_wrapper_execute().</doc>
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">the pointer returned by the execution, or %NULL if no result is 
available</doc>
           <type name="gpointer" c:type="gpointer"/>
         </return-value>
@@ -26234,7 +26009,10 @@ was called.</doc>
           <doc xml:space="preserve">the #GdaThreadWrapper</doc>
           <type name="ThreadWrapper" c:type="GdaThreadWrapper*"/>
         </parameter>
-        <parameter name="instance" transfer-ownership="none">
+        <parameter name="instance"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <doc xml:space="preserve">a pointer to the instance which emitted the signal</doc>
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
@@ -26250,11 +26028,17 @@ was called.</doc>
           <doc xml:space="preserve">array of @n_param_values GValue</doc>
           <type name="GObject.Value" c:type="const GValue*"/>
         </parameter>
-        <parameter name="gda_reserved" transfer-ownership="none">
+        <parameter name="gda_reserved"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <doc xml:space="preserve">reserved</doc>
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
-        <parameter name="data" transfer-ownership="none">
+        <parameter name="data"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <doc xml:space="preserve">a pointer to the data (which is the @data argument passed to 
gda_thread_wrapper_connect_raw())</doc>
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
@@ -26303,15 +26087,17 @@ was called.</doc>
     </enumeration>
     <callback name="ThreadWrapperFunc"
               c:type="GdaThreadWrapperFunc"
-              introspectable="0"
               throws="1">
       <doc xml:space="preserve">Specifies the type of function to be passed to 
gda_thread_wrapper_execute().</doc>
-      <return-value>
+      <return-value transfer-ownership="none" nullable="1">
         <doc xml:space="preserve">a pointer to some data which will be returned by 
gda_thread_wrapper_fetch_result()</doc>
         <type name="gpointer" c:type="gpointer"/>
       </return-value>
       <parameters>
-        <parameter name="arg" transfer-ownership="none">
+        <parameter name="arg"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <doc xml:space="preserve">pointer to the data (which is the @arg argument passed to 
gda_thread_wrapper_execute_void())</doc>
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
@@ -26329,7 +26115,10 @@ was called.</doc>
         <type name="none" c:type="void"/>
       </return-value>
       <parameters>
-        <parameter name="arg" transfer-ownership="none">
+        <parameter name="arg"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <doc xml:space="preserve">a pointer to the data (which is the @arg argument passed to 
gda_thread_wrapper_execute_void())</doc>
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
@@ -26396,11 +26185,14 @@ Note: the resulting will always be a valid time.</doc>
         </parameters>
       </method>
       <function name="copy" c:identifier="gda_time_copy">
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <type name="gpointer" c:type="gpointer"/>
         </return-value>
         <parameters>
-          <parameter name="boxed" transfer-ownership="none">
+          <parameter name="boxed"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
         </parameters>
@@ -26410,7 +26202,10 @@ Note: the resulting will always be a valid time.</doc>
           <type name="none" c:type="void"/>
         </return-value>
         <parameters>
-          <parameter name="boxed" transfer-ownership="none">
+          <parameter name="boxed"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
         </parameters>
@@ -26487,11 +26282,14 @@ Note: the resulting will always be a valid time.</doc>
         </parameters>
       </method>
       <function name="copy" c:identifier="gda_timestamp_copy">
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <type name="gpointer" c:type="gpointer"/>
         </return-value>
         <parameters>
-          <parameter name="boxed" transfer-ownership="none">
+          <parameter name="boxed"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
         </parameters>
@@ -26501,7 +26299,10 @@ Note: the resulting will always be a valid time.</doc>
           <type name="none" c:type="void"/>
         </return-value>
         <parameters>
-          <parameter name="boxed" transfer-ownership="none">
+          <parameter name="boxed"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <type name="gpointer" c:type="gpointer"/>
           </parameter>
         </parameters>
@@ -26602,7 +26403,7 @@ full control of transactions to be used with providers.</doc>
         </parameters>
       </method>
       <method name="find" c:identifier="gda_transaction_status_find">
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <type name="TransactionStatus" c:type="GdaTransactionStatus*"/>
         </return-value>
         <parameters>
@@ -26622,7 +26423,7 @@ full control of transactions to be used with providers.</doc>
               c:identifier="gda_transaction_status_find_current">
         <doc xml:space="preserve">Find a pointer to the "current" _unnamed_ transaction, which is the last
 transaction if there are several nested transactions</doc>
-        <return-value transfer-ownership="full">
+        <return-value transfer-ownership="full" nullable="1">
           <type name="TransactionStatus" c:type="GdaTransactionStatus*"/>
         </return-value>
         <parameters>
@@ -26900,7 +26701,7 @@ transaction if there are several nested transactions</doc>
       </method>
       <method name="get_node" c:identifier="gda_tree_get_node" version="4.2">
         <doc xml:space="preserve">Locates a #GdaTreeNode using the @tree_path path.</doc>
-        <return-value transfer-ownership="none">
+        <return-value transfer-ownership="none" nullable="1">
           <doc xml:space="preserve">the requested #GdaTreeNode pointer, or %NULL if not found</doc>
           <type name="TreeNode" c:type="GdaTreeNode*"/>
         </return-value>
@@ -28803,7 +28604,10 @@ are converted to "%ab" where ab is the hexadecimal representation of the charact
           <type name="AttributesManagerSignal"
                 c:type="GdaAttributesManagerSignal"/>
         </parameter>
-        <parameter name="signal_data" transfer-ownership="none">
+        <parameter name="signal_data"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
       </parameters>
@@ -28812,14 +28616,17 @@ are converted to "%ab" where ab is the hexadecimal representation of the charact
               c:identifier="gda_binary_copy"
               moved-to="Binary.copy">
       <doc xml:space="preserve">Creates a new #GdaBinary structure from an existing one.</doc>
-      <return-value transfer-ownership="full">
+      <return-value transfer-ownership="full" nullable="1">
         <doc xml:space="preserve">a newly allocated #GdaBinary which contains a copy of information in 
@boxed.
 
 Free-function: gda_binary_free</doc>
         <type name="gpointer" c:type="gpointer"/>
       </return-value>
       <parameters>
-        <parameter name="boxed" transfer-ownership="none">
+        <parameter name="boxed"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <doc xml:space="preserve">source to get a copy from.</doc>
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
@@ -28833,7 +28640,10 @@ Free-function: gda_binary_free</doc>
         <type name="none" c:type="void"/>
       </return-value>
       <parameters>
-        <parameter name="boxed" transfer-ownership="full">
+        <parameter name="boxed"
+                   transfer-ownership="full"
+                   nullable="1"
+                   allow-none="1">
           <doc xml:space="preserve">#GdaBinary to free.</doc>
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
@@ -28843,14 +28653,17 @@ Free-function: gda_binary_free</doc>
               c:identifier="gda_blob_copy"
               moved-to="Blob.copy">
       <doc xml:space="preserve">Creates a new #GdaBlob structure from an existing one.</doc>
-      <return-value transfer-ownership="full">
+      <return-value transfer-ownership="full" nullable="1">
         <doc xml:space="preserve">a newly allocated #GdaBlob which contains a copy of information in @boxed.
 
 Free-function: gda_blob_free</doc>
         <type name="gpointer" c:type="gpointer"/>
       </return-value>
       <parameters>
-        <parameter name="boxed" transfer-ownership="none">
+        <parameter name="boxed"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <doc xml:space="preserve">source to get a copy from.</doc>
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
@@ -28864,7 +28677,10 @@ Free-function: gda_blob_free</doc>
         <type name="none" c:type="void"/>
       </return-value>
       <parameters>
-        <parameter name="boxed" transfer-ownership="full">
+        <parameter name="boxed"
+                   transfer-ownership="full"
+                   nullable="1"
+                   allow-none="1">
           <doc xml:space="preserve">#GdaBlob to free.</doc>
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
@@ -28875,7 +28691,7 @@ Free-function: gda_blob_free</doc>
       <doc xml:space="preserve">Creates an array of strings (terminated by a %NULL) corresponding to 
possible completions.
 If no completion is available, then the returned array contains just one NULL entry, and
 if it was not possible to try to compute a completions list, then %NULL is returned.</doc>
-      <return-value transfer-ownership="full">
+      <return-value transfer-ownership="full" nullable="1">
         <doc xml:space="preserve">a new array of strings, or %NULL (use g_strfreev() to free the returned 
array)</doc>
         <array c:type="gchar**">
           <type name="utf8"/>
@@ -29169,11 +28985,14 @@ returned by #g_type_name.</doc>
     <function name="geometricpoint_copy"
               c:identifier="gda_geometricpoint_copy"
               moved-to="GeometricPoint.copy">
-      <return-value transfer-ownership="full">
+      <return-value transfer-ownership="full" nullable="1">
         <type name="gpointer" c:type="gpointer"/>
       </return-value>
       <parameters>
-        <parameter name="boxed" transfer-ownership="none">
+        <parameter name="boxed"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
       </parameters>
@@ -29185,11 +29004,31 @@ returned by #g_type_name.</doc>
         <type name="none" c:type="void"/>
       </return-value>
       <parameters>
-        <parameter name="boxed" transfer-ownership="none">
+        <parameter name="boxed"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
       </parameters>
     </function>
+    <function name="get_application_exec_path"
+              c:identifier="gda_get_application_exec_path">
+      <doc xml:space="preserve">Find the path to the application identified by @app_name. For example if the 
application
+is "gda-sql", then calling this function will return
+"/your/prefix/bin/gda-sql-5.0" if Libgda is installed in
+the "/your/prefix" prefix (which would usually be "/usr"), and for the ABI version 5.0.</doc>
+      <return-value transfer-ownership="full">
+        <doc xml:space="preserve">the path as a new string, or %NULL if the application cannot be found</doc>
+        <type name="utf8" c:type="gchar*"/>
+      </return-value>
+      <parameters>
+        <parameter name="app_name" transfer-ownership="none">
+          <doc xml:space="preserve">the name of the application to find</doc>
+          <type name="utf8" c:type="const gchar*"/>
+        </parameter>
+      </parameters>
+    </function>
     <function name="identifier_equal" c:identifier="gda_identifier_equal">
       <doc xml:space="preserve">Does the same as strcmp(@id1, @id2), but handles the case where id1 and/or 
id2 are enclosed in double quotes.
 can also be used in hash tables as a #GEqualFunc.</doc>
@@ -29221,6 +29060,28 @@ can also be used in hash tables as a #GEqualFunc.</doc>
         </parameter>
       </parameters>
     </function>
+    <function name="init" c:identifier="gda_init">
+      <doc xml:space="preserve">Initializes the GDA library, must be called prior to any Libgda usage.
+
+Please note that if you call setlocale() to modify the current locale, you should also
+call gda_locale_changed() before using Libgda again.</doc>
+      <return-value transfer-ownership="none">
+        <type name="none" c:type="void"/>
+      </return-value>
+    </function>
+    <function name="locale_changed"
+              c:identifier="gda_locale_changed"
+              version="4.2.3">
+      <doc xml:space="preserve">Call this function whenever the setlocale() function has been called
+to change the current locale; this function is first called by gda_init() so you
+don't need to call it if you have set the locale before calling gda_init().
+
+Failing to call this function after having changed the current locale may result
+in Libgda reverting to the previous set locale.</doc>
+      <return-value transfer-ownership="none">
+        <type name="none" c:type="void"/>
+      </return-value>
+    </function>
     <function name="log_disable" c:identifier="gda_log_disable">
       <doc xml:space="preserve">Disables GDA logs.</doc>
       <return-value transfer-ownership="none">
@@ -29867,7 +29728,7 @@ each part is either a text surrounded by double quotes which can contain upper a
 an SQL identifier in lower case.
 
 For example the &lt;![CDATA["test.\"ATable\""]]&gt; string will result in the array: &lt;![CDATA[{"test", 
"\"ATable\"", NULL}]]&gt;</doc>
-      <return-value transfer-ownership="full">
+      <return-value transfer-ownership="full" nullable="1">
         <doc xml:space="preserve">a new %NULL-terminated array of strings, or NULL (use g_strfreev() to free 
the returned array)</doc>
         <array c:type="gchar**">
           <type name="utf8"/>
@@ -30058,11 +29919,14 @@ of the non alphanumeric char.</doc>
     <function name="time_copy"
               c:identifier="gda_time_copy"
               moved-to="Time.copy">
-      <return-value transfer-ownership="full">
+      <return-value transfer-ownership="full" nullable="1">
         <type name="gpointer" c:type="gpointer"/>
       </return-value>
       <parameters>
-        <parameter name="boxed" transfer-ownership="none">
+        <parameter name="boxed"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
       </parameters>
@@ -30074,7 +29938,10 @@ of the non alphanumeric char.</doc>
         <type name="none" c:type="void"/>
       </return-value>
       <parameters>
-        <parameter name="boxed" transfer-ownership="none">
+        <parameter name="boxed"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
       </parameters>
@@ -30082,11 +29949,14 @@ of the non alphanumeric char.</doc>
     <function name="timestamp_copy"
               c:identifier="gda_timestamp_copy"
               moved-to="Timestamp.copy">
-      <return-value transfer-ownership="full">
+      <return-value transfer-ownership="full" nullable="1">
         <type name="gpointer" c:type="gpointer"/>
       </return-value>
       <parameters>
-        <parameter name="boxed" transfer-ownership="none">
+        <parameter name="boxed"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
       </parameters>
@@ -30098,7 +29968,10 @@ of the non alphanumeric char.</doc>
         <type name="none" c:type="void"/>
       </return-value>
       <parameters>
-        <parameter name="boxed" transfer-ownership="none">
+        <parameter name="boxed"
+                   transfer-ownership="none"
+                   nullable="1"
+                   allow-none="1">
           <type name="gpointer" c:type="gpointer"/>
         </parameter>
       </parameters>


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