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      1 <grammar xmlns="http://relaxng.org/ns/structure/1.0">
      2   <start>
      3     <ref name="top"/>
      4   </start>
      5   <define name="empty">
      6     <empty/>
      7   </define>
      8   <define name="top">
      9     <element name="top">
     10       <choice>
     11         <ref name="empty"/>
     12         <element name="a">
     13 	  <text/>
     14         </element>
     15       </choice>
     16     </element>
     17   </define>
     18 </grammar>
     19