<?xml version="1.0"?>
<pml_schema version="1.1"
  xmlns="http://ufal.mff.cuni.cz/pdt/pml/schema/">
  <description>Example of constituency tree annotation</description>
  <root name="annotation">
    <sequence role="#TREES" content_pattern="meta, nt+">
      <element name="meta" type="meta.type"/>
      <element name="nt" type="nonterminal.type"/>
    </sequence>
  </root>
  <type name="meta.type">
    <structure>
      <member name="annotator"><cdata format="any"/></member>
      <member name="datetime"><cdata format="any"/></member>
    </structure>
  </type>
  <type name="nonterminal.type">
    <container role="#NODE">
      <attribute name="label" type="label.type"/>
      <sequence role="#CHILDNODES">
	<element name="nt" type="nonterminal.type"/>
	<element name="form" type="terminal.type"/>
      </sequence>
    </container>
  </type>
  <type name="terminal.type">
    <container role="#NODE">
      <cdata format="any"/>
    </container>
  </type>
  <type name="label.type">
    <choice>
      <value>S</value>
      <value>VP</value>
      <value>NP</value>
      <value>PP</value>
      <value>ADVP</value>
      <!-- etc. -->
    </choice>
  </type>

</pml_schema>