<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema'>
  <xs:group name="concept">
  	<xs:sequence>
  	  <xs:element ref="concept" />
  	</xs:sequence>
  </xs:group>
  
  <xs:group name="conbody">
  	<xs:sequence>
  	  <xs:element ref="conbody" />
  	</xs:sequence>
  </xs:group>
  
</xs:schema>