[vala: 4/4] doap: Add description as required

[Rico Tzschichholz <ricotz src gnome org>]

commit f56ac63b6c6d3e9238cb1bb11e0ae726bbaf6434
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sun Nov 6 10:11:50 2016 +0100

    doap: Add description as required

 vala.doap |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)
---
diff --git a/vala.doap b/vala.doap
index 13df55b..2157225 100644
--- a/vala.doap
+++ b/vala.doap
@@ -7,6 +7,28 @@
 
   <name xml:lang="en">vala</name>
   <shortdesc xml:lang="en">Compiler for the GObject type system</shortdesc>
+  <description>valac, the Vala compiler, is a self-hosting compiler that translates
+Vala source code into C source and header files. It uses the GObject type system
+to create classes and interfaces declared in the Vala source code.
+
+The syntax of Vala is similar to C#, modified to better fit the GObject type system.
+Vala supports modern language features as the following: Interfaces, Properties,
+Signals, Foreach, Lambda expressions, Type inference for local variables, Generics,
+Non-null types, Assisted memory management, Exception handling, Type modules (Plugins)
+
+Vala is designed to allow access to existing C libraries, especially GObject-based
+libraries, without the need for runtime bindings. All that is needed to use a library
+with Vala is an API file, containing the class and method declarations in Vala syntax.
+Vala currently comes with bindings for GLib and GTK+ and many others from the GNOME
+Platform.
+
+Using classes and methods written in Vala from an application written in C is not
+difficult. The Vala library only has to install the generated header files and C
+applications may then access the GObject-based API of the Vala library as usual.
+It should also be easily possible to write a bindings generator for access to Vala
+libraries from applications written in e.g. C# as the Vala parser is written as
+a library, so that all compile-time information is available when generating a
+binding.</description>
 
   <homepage rdf:resource="https://wiki.gnome.org/Projects/Vala"; />
   <mailing-list rdf:resource="http://mail.gnome.org/mailman/listinfo/vala-list"; />