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<?xml encoding="ISO-8859-1"?>

<!-- Copyright (C) 2000-2004, HELM Team                                -->
<!--                                                                   -->
<!-- This file is part of HELM, an Hypertextual, Electronic            -->
<!-- Library of Mathematics, developed at the Computer Science         -->
<!-- Department, University of Bologna, Italy.                         -->
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<!-- Notice: the markup described in this DTD is meant to be embedded -->
<!-- in foreign markup (e.g. XHTML)                                   -->

<!ENTITY % theorystructure
  '(ht:AXIOM|ht:DEFINITION|ht:THEOREM|ht:VARIABLE|ht:SECTION|ht:MUTUAL)*'>

<!ELEMENT ht:SECTION (%theorystructure;)>
<!ATTLIST ht:SECTION
          uri CDATA #REQUIRED>

<!ELEMENT ht:MUTUAL (ht:DEFINITION,ht:DEFINITION+)>

<!-- Theory Items -->

<!ELEMENT ht:AXIOM (Axiom)>
<!ATTLIST ht:AXIOM
          uri CDATA #REQUIRED
          as (Axiom|Declaration) #REQUIRED>

<!ELEMENT ht:DEFINITION (Definition|InductiveDefinition)>
<!ATTLIST ht:DEFINITION
          uri CDATA #REQUIRED
          as (Definition|InteractiveDefinition|Inductive|CoInductive
             |Record) #REQUIRED>

<!ELEMENT ht:THEOREM (type)>
<!ATTLIST ht:THEOREM
          uri CDATA #REQUIRED
          as (Theorem|Lemma|Corollary|Fact|Remark) #REQUIRED>

<!ELEMENT ht:VARIABLE (Variable)>
<!ATTLIST ht:VARIABLE
          uri CDATA #REQUIRED
          as (Assumption|Hypothesis|LocalDefinition|LocalFact) #REQUIRED>