[xml] unexpected behavior with RELAX-NG

[Seth Daniel <libxml sethdaniel org>]

Hello,

I have two RELAX-NG files.  As far as I know they should be equivalent.
However, the first one will properly validate a conforming XML file and
the second will not.  

First RELAX-NG file (good.rng):

<?xml version="1.0"?>
<grammar xmlns="http://relaxng.org/ns/structure/1.0";>
  <start>
    <element name="ABC">
      <element name="required">
        <attribute name="value"/>
      </element>
      <zeroOrMore>
        <element>
          <anyName/>
          <attribute name="value"/>
        </element>
      </zeroOrMore>
    </element>
  </start>
</grammar>


Second RELAX-NG file (bad.rng):

<?xml version="1.0"?>
<grammar xmlns="http://relaxng.org/ns/structure/1.0";>
                                                                                
  <start>
    <element name="ABC">
      <ref name="requiredElem"/>
      <zeroOrMore>
        <ref name="anyElem"/>
      </zeroOrMore>
    </element>
  </start>
                                                                                
  <define name="requiredElem">
    <element name="required">
      <attribute name="value"/>
    </element>
  </define>
                                                                                
  <define name="anyElem">
    <element>
      <anyName/>
      <attribute name="value"/>
    </element>
  </define>
</grammar>


Simple conforming XML file (t.xml):

<?xml version="1.0"?>
<ABC>
  <required value="A"/>
  <anything1 value="B"/>
  <anything2 value="C"/>
</ABC>


Output of xmllint using good.rng:

$ xmllint --noout --relaxng good.rng t.xml
t.xml validates


Output of xmllint using bad.rng:

$ xmllint --noout --relaxng bad.rng t.xml
RNG validity error: file t.xml line 4 element anything1
Did not expect element anything1 there
t.xml fails to validate

-- 
seth / @sethdaniel.org