libxml2/test/relaxng/rngbug-001.rng

<?xml version="1.0" encoding="UTF-8"?>
<grammar xmlns="http://relaxng.org/ns/structure/1.0">
  <start>
    <ref name="root"/>
  </start>
  <define name="root">
    <element name="root">
      <interleave>
        <element name="e1">
          <text/>
        </element>
        <externalRef href="rngbug-001.ext"/>
      </interleave>
    </element>
  </define>
</grammar>