composable-pb_type.xml

<?xml version="1.0" ?>
<pb_type name="top" num_pb="1" xmlns:xi="http://www.w3.org/2001/XInclude">
  <pb_type name="top_inner" num_pb="1" >
    <xi:include href="composable-pb_type-inner.xml" xpointer="xpointer(pb_type/child::node())"/>
  </pb_type>
  <pb_type name="middle" num_pb="1">
    <xi:include href="composable-pb_type-middle.xml" xpointer="xpointer(pb_type/child::node())"/>
  </pb_type>
</pb_type>