Please describe the problem:
I want to include XHTML Basic 1.0 RelaxNG schema
<http://www.thaiopensource.com/relaxng/xhtml/> and redefine some parts.  For
example, I want to remove <br>:

<?xml version="1.0" encoding="windows-1251"?>
<grammar xmlns="http://relaxng.org/ns/structure/1.0"
  ns="http://www.w3.org/1999/xhtml">

  <include href="../xhtml/xhtml-basic.rng">

    <define name="br">
      <element name="br">
	<notAllowed/>
      </element>
    </define>

  </include>

</grammar>

But I get the following error:

.../1.1/text.rng:5: element include: Relax-NG parser error : xmlRelaxNG: include
.../xhtml/xhtml-basic.rng has a define br but not the included grammar
.../xhtml/modules/text.rng:5: element define: Relax-NG parser error : Some
defines for br needs the combine attribute
Relax-NG schema .../1.1/text.rng failed to compile

xhtml-basic.rng consists only of <include>s of modules, so I suspected that the
reason is that the reason is that redefined <define> is in <include> of
<include>.  I found that this is correct.  After directly <include> of XHTML
Basic RelaxNG schema modules, there were no errors.

So the conclusion is that libxml2 2.6.16 can't redefine definition of <include>
in <include>.  I've not tested if this is the case with latest libxml2.

Steps to reproduce:


Actual results:


Expected results:


Does this happen every time?


Other information: