<?xml version="1.0"?>
<pml_schema version="1.1" xmlns="http://ufal.mff.cuni.cz/pdt/pml/schema/">
  <revision>0.7</revision>
  <description>
    Example of tree annotation over a tokenization layer
  </description>
  <reference name="tokenization" readas="dom"/>

  <import type="w.type" schema="example6_schema.xml" revision="0.2"/>

  <!-- after DOM-knitting, #ID attribute contains a PMLREF -->
  <derive type="w.type">
    <container>
      <attribute name="id" role="#ID" required="1">
	<cdata format="PMLREF"/>
      </attribute>
    </container>
  </derive>

  <root name="annotation" type="annotation.type"/>

  <type name="annotation.type">
    <sequence role="#TREES">
      <element name="S" type="S.type"/>
    </sequence>
  </type>
  <type name="S.type">
    <container role="#NODE">
      <attribute name="sentence.rf">
	<cdata format="PMLREF"/>
      </attribute>
      <list ordered="1" role="#CHILDNODES" type="node.type"/>
    </container>
  </type>
  <type name="node.type">
    <structure role="#NODE">
      <member as_attribute="1" name="label" type="label.type"/>
      <member name="w.rf">
        <list ordered="0" role="#KNIT" type="w.type">
          <cdata format="PMLREF"/>
        </list>
      </member>
      <member name="constituents" role="#CHILDNODES">
        <list ordered="1" type="node.type"/>
      </member>
    </structure>
  </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>