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<?xml version="1.0" encoding="UTF-8"?>

<!-- DTD for PGML, the Proof General Markup Language		   -->
<!-- Author:  David Aspinall, LFCS, University of Edinburgh	   -->
<!-- Status:  Complete but experimental version.		   -->
<!-- Version: $Id$     -->

<!ELEMENT pgml (statedisplay | information | warning | error)*>
<!ATTLIST pgml 
	    version CDATA #IMPLIED>

<!ELEMENT statedisplay (statepart)*>
<!ATTLIST statedisplay 
	   systemid CDATA #IMPLIED
	   name	    CDATA #IMPLIED
           kind	    CDATA #IMPLIED>

<!ENTITY % termitem       "action | term | type | atom | sym">
<!ENTITY % nonactionitem  "term | type | atom | sym">

<!ELEMENT information (#PCDATA | %termitem;)*>
<!ATTLIST information
	   name	    CDATA #IMPLIED
           kind	    CDATA #IMPLIED>

<!ELEMENT warning (#PCDATA | %termitem;)*>
<!ATTLIST warning
	   name	    CDATA #IMPLIED
           kind	    CDATA #IMPLIED>

<!ELEMENT error (#PCDATA | %termitem;)*>
<!ATTLIST error
	   name	    CDATA #IMPLIED
           kind	    CDATA #IMPLIED>

<!ELEMENT statepart (#PCDATA | %termitem;)*>
<!ATTLIST statepart 
	   systemid CDATA #IMPLIED
	   name     CDATA #IMPLIED
	   kind	    CDATA #IMPLIED>

<!ELEMENT term (#PCDATA | %termitem;)*>
<!ATTLIST term 
           pos  CDATA #IMPLIED 
           kind CDATA #IMPLIED>

<!-- maybe combine this with term and add extra attr to term? -->
<!ELEMENT type (#PCDATA | %termitem;)*>
<!ATTLIST type 
	   kind CDATA #IMPLIED>

<!ELEMENT action (#PCDATA | %nonactionitem;)*>
<!ATTLIST action 
	   kind CDATA #IMPLIED>

<!ELEMENT atom (#PCDATA)>
<!ATTLIST atom 
	   kind CDATA #IMPLIED 
	   fullname CDATA #IMPLIED>

<!ELEMENT sym  (#PCDATA)>
<!ATTLIST sym  
	   name CDATA #IMPLIED
	   alt  CDATA #IMPLIED>

<!ELEMENT br EMPTY>