Problem with data in interleave in RELAX NG validation

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
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