From 1808f15362ca07bb4ad5b6802afbf6789683f0bd Mon Sep 17 00:00:00 2001
From: Claudio Sacerdoti Coen <claudio.sacerdoticoen@unibo.it>
Date: Mon, 20 May 2002 09:21:57 +0000
Subject: [PATCH] Metavariables representation changed. Explicit substitutions
 introduced.

---
 helm/dtd/cic.dtd | 29 ++++++++++++++++++++---------
 1 file changed, 20 insertions(+), 9 deletions(-)

diff --git a/helm/dtd/cic.dtd b/helm/dtd/cic.dtd
index a2156a522..088c78abf 100644
--- a/helm/dtd/cic.dtd
+++ b/helm/dtd/cic.dtd
@@ -42,6 +42,9 @@
 
 <!ENTITY % sort '(Prop|Set|Type)'>
 
+<!-- CIC sequents -->
+
+<!ENTITY % sequent '((Decl|Def|Hidden)*,Goal)'>
 
 <!-- CIC objects: -->
 
@@ -74,9 +77,10 @@
           name CDATA #REQUIRED
           id   ID    #REQUIRED>
 
-<!ELEMENT Sequent ((Decl|Def)*,Goal)>
+<!ELEMENT Sequent %sequent;>
 <!ATTLIST Sequent
-          id   ID    #REQUIRED>
+          no  NMTOKEN #REQUIRED
+          id  ID      #REQUIRED>
 
 <!-- Elements used in CIC objects, which are not terms: -->
 
@@ -85,7 +89,7 @@
           name      CDATA        #REQUIRED
           inductive (true|false) #REQUIRED>
 
-<!ELEMENT Conjecture %term;>
+<!ELEMENT Conjecture %sequent;>
 <!ATTLIST Conjecture
           no NMTOKEN #REQUIRED>
 
@@ -95,11 +99,13 @@
 
 <!ELEMENT Decl %term;>
 <!ATTLIST Decl
-          name CDATA #REQUIRED>
+          name CDATA #IMPLIED>
 
 <!ELEMENT Def %term;>
 <!ATTLIST Def
-          name CDATA #REQUIRED>
+          name CDATA #IMPLIED>
+
+<!ELEMENT Hidden EMPTY>
 
 <!ELEMENT Goal %term;>
 
@@ -148,11 +154,14 @@
           id     ID     #REQUIRED
           sort   %sort; #REQUIRED>
 
-<!ELEMENT META EMPTY>
+<!-- The substitutions are ordered by increasing DeBrujin  -->
+<!-- index. An empty substitution means that that index is -->
+<!-- not accessible.                                       -->
+<!ELEMENT META (substitution*)>
 <!ATTLIST META
-          no   NMTOKEN #REQUIRED
-          id   ID      #REQUIRED
-          sort %sort;  #REQUIRED>
+          no              NMTOKEN #REQUIRED
+          id              ID      #REQUIRED
+          sort            %sort;  #REQUIRED>
 
 <!ELEMENT IMPLICIT EMPTY>
 <!ATTLIST IMPLICIT
@@ -208,6 +217,8 @@
 <!ATTLIST CofixFunction
           name     CDATA   #REQUIRED>
 
+<!ELEMENT substitution ((%term;)?)>
+
 <!-- Sintactic sugar for CIC terms and for CIC objects: -->
 
 <!ELEMENT source %term;>
-- 
2.39.2