[xml] libxml2 and PI <?xml-model?>

[Thomas Schraitle <tom_schr web de>]

Hi 

for version 12.x, the oXygen XML editor implemented a new W3C's processing 
instruction (PI) named xml-model[1]. An example file could look like this:

------------------8<------------------
<?xml version="1.0" encoding="UTF-8"?>
<?xml-model href="docbook.rnc" type="application/relax-ng-compact-syntax"?>
<section xmlns="http://docbook.org/ns/docbook"; version="5.0">
  <title>Test</title>
  <para>Test</para>
</section>
------------------8<------------------

However, using xmllint gives me the following error:

$ rpm -q libxml2
libxml2-2.7.7-4.5.1.x86_64
$ xmllint --noout test-xml-model.xml 
xml/structure/test-xml-model.xml:2: parser warning : xmlParsePITarget: invalid 
name prefix 'xml'
<?xml-model href="docbook.rnc" type="application/relax-ng-compact-syntax"?>
           ^

It seems the above PI isn't known in the libxml2 documentation. Also no 
bugzilla entry exists related to the above PI. 

This is unfortunate as such files can not processed by xmllint or xsltproc 
anymore. Before I open a bug, I thought I just ask for some feedback.


Thanks!
  Tom

-------
[1] http://www.w3.org/TR/xml-model/