<?xml version="1.0" encoding="UTF-8"?>
<grammar xmlns="http://relaxng.org/ns/structure/1.0">
  <!--
    
    The master container.
    
  -->
  <start>
    <element name="root">
      <ref name="attribute.name"/>
      <optional>
        <ref name="element.onedown"/>
      </optional>
    </element>
  </start>
  <define name="attribute.name">
    <attribute name="name"/>
  </define>
  <define name="element.onedown">
    <element name="onedown">
      <optional>
        <ref name="attribute.name"/>
      </optional>
      <zeroOrMore>
        <ref name="element.twodown"/>
      </zeroOrMore>
    </element>
  </define>
  <define name="element.twodown">
    <element name="twodown">
      <ref name="attribute.name"/>
    </element>
  </define>
</grammar>