<?xml version="1.0" encoding="UTF-8"?>
<doctype>
  <attributeGroup name="global.extra"/>
  <attributeGroup name="global">
    <attribute>
      <name>id</name>
      <tokenized name="ID"/>
      <implied/>
    </attribute>
    <attribute>
      <name>class</name>
      <tokenized name="NMTOKEN"/>
      <implied/>
    </attribute>
    <attributeGroupRef name="global.extra"/>
  </attributeGroup>
  <element>
    <name>foo</name>
    <zeroOrMore>
      <elementRef>
        <name>bar</name>
      </elementRef>
    </zeroOrMore>
  </element>
  <attlist>
    <name>foo</name>
    <attributeGroupRef name="global"/>
  </attlist>
  <element>
    <name>bar</name>
    <sequence/>
  </element>
  <attlist>
    <name>bar</name>
    <attributeGroupRef name="global"/>
  </attlist>
</doctype>