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Re: [xml-bindings]Composing documents using Python and libxslt

On Thu, Apr 04, 2002 at 04:12:25PM +0200, Jørgen Frøjk Kjærsgaard wrote:
> Hi,
> 
> I need to be able to compose XML documents from Python-generated 
> sub-ducuments. To do this I register a Python extension function using 
> xsltRegisterExtModuleFunction(). 
> 
> However, I am unable to create an include function, which can be used in my 
> XML documents. Two things go wrong for some reason:

  Well you're on the bleeding edge :-)

> 1) When the argument to the include function itself is an XPath expression, 
> it is passed to my Python program as a list of C objects (case 1,2 in the 
> test document below), whereas it is passed as a string if I write a string 
> directly (case 3).

  Yes to return a node set you would have to return a list of libxml2
nodes.

> 2) When I attempt to apply-templates to the result of my external Python 
> function, I get no output.

  Hum, no idea ATM. I would have to work on debugging this.

> I have previously succeeded in doing this using Sablotron, however Sablotron 
> seems to have some serious memory management bugs, which makes it crash all 
> the time when running under apache and mod_python. libxml/libxslt seems to be 
> a much stronger toolcase...
> 
> ** The function:
> 
>     def _include(self, ctx, str):
>         print "- CALLING INCLUDE(%s:%s)" % (str[0], type(str))
>         return "<pre>python pre</pre>"
> 
> ** The stylesheet:
> 
> <?xml version="1.0"?>
> <xsl:stylesheet version="1.0"
>  xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
>  xmlns:mtr="http://metation.com/mtr";
>  exclude-result-prefixes="mtr"
> >
> 
> <xsl:output method="html" indent="yes"/>
> 
> <xsl:template match="test">
>   <html>
>   test tag start
>   <xsl:apply-templates/>
>   test tag slut
>   </html>
> </xsl:template>
> 
> 
> <xsl:template match="include">
>   INCLUDE:<xsl:apply-templates select="mtr:include(@resource)"/>:INCLUDE
> </xsl:template>
> 
> 
> <xsl:template match="include-raw">
>   INCLUDE-RAW:<xsl:value-of select="mtr:include(@resource)"/>:INCLUDE-RAW
> </xsl:template>
> 
> <xsl:template match="incl-direct">
>   INCL-DIRECT:<xsl:value-of select="mtr:include('DIRECT')"/>:INCL-DIRECT
> </xsl:template>
> 
> <xsl:template match="pre">
>   <PRE>
>   <xsl:value-of select="."/>
>   </PRE>
> </xsl:template>
> 
> </xsl:stylesheet>
> 
> ** The test document:
> 
> <test>
>   <include resource="TEST"/>                  <!-- case 1 -->
>   <include-raw resource="RAWTEST"/>     <!-- case 2 -->
>   <incl-direct resource="DIRTEST"/>         <!-- case 3 -->
>   <pre>direkte pre</pre>
> </test>
> 
> ** The result:
> 
> - CALLING INCLUDE(<PyCObject object at 0x81edcf0>:<type 'list'>)
> - CALLING INCLUDE(<PyCObject object at 0x81edd18>:<type 'list'>)
> - CALLING INCLUDE(D:<type 'string'>)
> <html>
>   test tag start
> 
> 
>   INCLUDE::INCLUDE
> 
> 
>   INCLUDE-RAW:&lt;pre&gt;python pre&lt;/pre&gt;:INCLUDE-RAW
> 
> 
>   INCL-DIRECT:&lt;pre&gt;python pre&lt;/pre&gt;:INCL-DIRECT
> 
>   <PRE>direkte pre</PRE>
> 
>   test tag slut
>   </html>
> 
> 
> Thanks, jfk

  I can't garantee I will be able to work on this really soon, would
you mind posting this on the bugzilla for libxslt so I don't forget your
problem ?
     http://xmlsoft.org/XSLT/bugs.html

 TIA,

Daniel

-- 
Daniel Veillard      | Red Hat Network https://rhn.redhat.com/
veillard redhat com  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
http://veillard.com/ | Rpmfind RPM search engine http://rpmfind.net/
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