[xml] Problem with data in interleave in RELAX NG validation

[Nikolai Weibull <now disu se>]

Hi!

Given the following input RELAX NG grammar:

<grammar xmlns="http://relaxng.org/ns/structure/1.0";
        datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes";>
 <start>
   <element name="a">
     <interleave>
       <attribute name="b"/>
       <data type="string"/>
     </interleave>
   </element>
 </start>
</grammar>

and the following input document a.xml:

<a b="1">c</a>

xmllint reports:

a.xml:1: element a: Relax-NG validity error : Element a has extra 
content: text
a.xml fails to validate

Changing the interleave to a group solves the issue, so the 
problem is with how interleaves are validated.

I looked at xmlRelaxNGValidateInterleave() and I sadly have no 
idea what’s going on.  Please point me in the right direction and 
I’ll gladly write a patch.

 Nikolai