<?xml version="1.0" encoding="UTF-8"?>
<doctype>
  <param name="e1">EMPTY</param>
  <element>
    <name>foo</name>
    <sequence/>
  </element>
  <element>
    <name>bar</name>
    <elementRef>
      <name>EMPTY</name>
    </elementRef>
  </element>
</doctype>
