[libxml2] Fix libxml2.doap

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 9277abe25be0fb41dfa5294a487601594bfcf6ee
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Sun Jan 16 15:50:56 2022 +0100

    Fix libxml2.doap
    
    Add description.
    
    Change category to "infrastructure". Apparently, "platform" isn't
    allowed anymore.
    
    Add programming language.

 libxml2.doap | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)
---
diff --git a/libxml2.doap b/libxml2.doap
index 272ea5f9..32ac7dbe 100644
--- a/libxml2.doap
+++ b/libxml2.doap
@@ -6,9 +6,22 @@
 
   <name xml:lang="en">libxml2</name>
   <shortdesc xml:lang="en">XML parser and markup toolkit</shortdesc>
+  <description>Libxml2 is the XML C parser and toolkit developed for the Gnome
+project (but usable outside of the Gnome platform), it is free software
+available under the MIT License. XML itself is a metalanguage to design markup
+languages, i.e. text language where semantic and structure are added to the
+content using extra "markup" information enclosed between angle brackets. HTML
+is the most well-known markup language. Though the library is written in C a
+variety of language bindings make it available in other environments.
+
+Libxml2 is known to be very portable, the library should build and work
+without serious troubles on a variety of systems (Linux, Unix, Windows,
+CygWin, MacOS, MacOS X, RISC Os, OS/2, VMS, QNX, MVS, VxWorks,
+...)</description>
   <homepage rdf:resource="http://xmlsoft.org/"; />
   <mailing-list rdf:resource="http://mail.gnome.org/mailman/listinfo/xml"; />
-  <category rdf:resource="http://api.gnome.org/doap-extensions#platform"; />
+  <category rdf:resource="http://api.gnome.org/doap-extensions#infrastructure"; />
+  <programming-language>C</programming-language>
 
   <maintainer>
     <foaf:Person>