--- /dev/null
+<?xml encoding="ISO-8859-1"?>
+
+<!-- Copyright (C) 2000, HELM Team -->
+<!-- -->
+<!-- This file is part of HELM, an Hypertextual, Electronic -->
+<!-- Library of Mathematics, developed at the Computer Science -->
+<!-- Department, University of Bologna, Italy. -->
+<!-- -->
+<!-- HELM is free software; you can redistribute it and/or -->
+<!-- modify it under the terms of the GNU General Public License -->
+<!-- as published by the Free Software Foundation; either version 2 -->
+<!-- of the License, or (at your option) any later version. -->
+<!-- -->
+<!-- HELM is distributed in the hope that it will be useful, -->
+<!-- but WITHOUT ANY WARRANTY; without even the implied warranty of -->
+<!-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -->
+<!-- GNU General Public License for more details. -->
+<!-- -->
+<!-- You should have received a copy of the GNU General Public License -->
+<!-- along with HELM; if not, write to the Free Software -->
+<!-- Foundation, Inc., 59 Temple Place - Suite 330, Boston, -->
+<!-- MA 02111-1307, USA. -->
+<!-- -->
+<!-- For details, see the HELM World-Wide-Web page, -->
+<!-- http://cs.unibo.it/helm/. -->
+
+<!--*****************************************************************-->
+<!-- DTD FOR THEORY OBJECTS AT LEVEL OF CIC XML FILES: -->
+<!-- First draft: May 10 2000, Claudio Sacerdoti Coen, Irene Schena -->
+<!-- Revised: February 2001, Claudio Sacerdoti Coen -->
+<!-- Revised: May 01 2001, Claudio Sacerdoti Coen -->
+<!--*****************************************************************-->
+
+
+<!--*****************************************************************-->
+<!-- Note: the intended meaning for this markup is to be embedded -->
+<!-- into other types of markup (e.g. XHTML or DocBook). Hence, the -->
+<!-- DTD is only "indicative" and no root element is provided. -->
+<!--*****************************************************************-->
+
+<!ENTITY % mathstructure
+ '(ht:AXIOM|ht:DEFINITION|ht:THEOREM|ht:VARIABLE|ht:SECTION|ht:MUTUAL)*'>
+
+<!ELEMENT ht:OBJECT EMPTY>
+<!ATTLIST ht:OBJECT
+ uri CDATA #REQUIRED
+ mode (typeonly|embed|linkonly) #REQUIRED>
+
+<!ELEMENT ht:AXIOM EMPTY>
+<!ATTLIST ht:AXIOM
+ uri CDATA #REQUIRED
+ as (Axiom|Declaration) #REQUIRED
+ typesetting ( paragraph | inline ) paragraph
+ heading ( true | false ) true
+ uri_base ( true | false ) true
+ notation ( true | false ) false
+ params ( true | false ) false
+ type ( true | false ) true >
+
+<!ELEMENT ht:DEFINITION EMPTY>
+<!ATTLIST ht:DEFINITION
+ uri CDATA #REQUIRED
+ as (Definition|InteractiveDefinition|Inductive|CoInductive
+ |Record) #REQUIRED
+ <!-- Should the definition take a whole new paragraph
+ or be integrated in the sentence? -->
+ typesetting ( paragraph | inline ) paragraph
+ <!-- Include the text "Definition "? -->
+ heading ( true | false ) true
+ <!-- Include the name of the definition, i.e.
+ the non-path part of its URI? -->
+ uri_base ( true | false ) true
+ <!-- Include the notation for this object? -->
+ notation ( true | false ) false
+ <!-- Include the section parameters / variables of
+ this definition? -->
+ params ( true | false ) false
+ <!-- For parametrised (co)inductive definitions,
+ include the parameters of the definition? -->
+ Params ( true | false ) true
+ <!-- Show the type? -->
+ type ( true | false ) true
+ <!-- Show the body? -->
+ body ( true | false ) true >
+
+<!ELEMENT ht:THEOREM EMPTY>
+<!ATTLIST ht:THEOREM
+ uri CDATA #REQUIRED
+ as (Theorem|Lemma|Corollary|Fact|Remark) #REQUIRED
+ typesetting ( paragraph | inline ) paragraph
+ heading ( true | false ) true
+ uri_base ( true | false ) true
+ notation ( true | false ) false
+ params ( true | false ) false
+ type ( true | false ) true
+ body ( true | false ) true >
+
+<!ELEMENT ht:VARIABLE EMPTY>
+<!ATTLIST ht:VARIABLE
+ uri CDATA #REQUIRED
+ as (Assumption|Hypothesis|LocalDefinition|LocalFact) #REQUIRED
+ typesetting ( paragraph | inline ) paragraph
+ heading ( true | false ) true
+ uri_base ( true | false ) true
+ notation ( true | false ) false
+ params ( true | false ) false
+ Params ( true | false ) true
+ type ( true | false ) true
+ body ( true | false ) true >
+
+<!ELEMENT ht:SECTION (%mathstructure;)>
+<!ATTLIST ht:SECTION
+ uri CDATA #REQUIRED>
+
+(*CSC: In the case of a set of mutual (Co)Inductive DEFINITIONS, *)
+(*CSC: all the entries inside ht:MUTUAL have the same URI ;-| *)
+<!ELEMENT ht:MUTUAL (ht:DEFINITION,ht:DEFINITION+)>