X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fstyle%2Fproofs.xsl;h=96d1ee7de532142ee3ce9ac18f7e4c6644950351;hb=0e9cfa8af4ac6569e350dac51b8f8482d124f71a;hp=a3f2a15078cdeed3588e53b6485dce568f5c28ac;hpb=22344b1810548a3a75e0a7f36d23e8f8117ff633;p=helm.git

diff --git a/helm/style/proofs.xsl b/helm/style/proofs.xsl
index a3f2a1507..96d1ee7de 100644
--- a/helm/style/proofs.xsl
+++ b/helm/style/proofs.xsl
@@ -1,8 +1,32 @@
 <?xml version="1.0"?>
 
+<!-- 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/.                                         -->
+
 <!--******************************************************************--> 
 <!-- Basic Logic                                                      -->
-<!-- First draft: April 3 2000                                        -->
+<!-- (completely) Revisited: february 2001, Andrea Asperti            -->
 <!-- HELM Group: Asperti, Padovani, Sacerdoti, Schena                 -->
 <!--******************************************************************-->
 
@@ -10,221 +34,325 @@
                               xmlns:m="http://www.w3.org/1998/Math/MathML"
                               xmlns:helm="http://www.cs.unibo.it/helm">
 
-<!--******************************************************************-->
-<!-- Variable containing the absolute path of the CIC file            -->
-<!--******************************************************************-->
-
-<xsl:variable name="absPath">http://localhost:8081/get?url=</xsl:variable>
-
 <!-- ************************* LOGIC *********************************-->
 
 <!-- Proof objects -->
 
-<!-- <xsl:key name="typeid" use="@id" match="TYPE"/> -->
+<!-- <xsl:key name="typeid" use="@of" match="TYPE"/> -->
 
-<xsl:template match="LAMBDA|PROD|CAST|REL|SORT|APPLY|VAR|META|CONST|MUTIND|MUTCONSTRUCT|MUTCASE|FIX|COFIX" mode="noannot">
-  <xsl:choose> 
-   <xsl:when test="@id">
-    <xsl:variable name="id" select="@id"/>
-    <xsl:choose>
-     <!-- <xsl:when test="//ALLTYPES and key('typeid',@id)"> -->
-     <xsl:when test="//ALLTYPES/TYPE[@id=$id]">
-     <xsl:choose>
-      <xsl:when test="name()= 'APPLY' and CONST[
- attribute::uri='cic:/coq/INIT/Logic_Type/eqT_ind.con' or
- attribute::uri='cic:/coq/ZARITH/auxiliary/eqT_ind_r.con'] and count(child::*) = 7">
-       <m:apply helm:xref="{@id}">
-        <m:csymbol>thread</m:csymbol>
-        <xsl:apply-templates mode="pure" select="//ALLTYPES/TYPE[@id=$id]"/>
-        <m:apply>
-         <m:csymbol>rw_step</m:csymbol>
-         <xsl:apply-templates mode="pure" select="*[3]"/>
-         <xsl:apply-templates mode="pure" select="*[6]"/>
-         <xsl:apply-templates mode="pure" select="*[7]"/>
-        </m:apply>
-        <xsl:apply-templates mode="thread" select="*[5]"/>
-       </m:apply>
-      </xsl:when>
-      <!-- aggiungere la verifica dell'esistenza dei lambda per and_ind -->
-      <xsl:when test="name()= 'APPLY' and CONST[
- attribute::uri='cic:/coq/INIT/Logic/Conjunction/and_ind.con'] 
- and count(child::*) = 6">
-       <m:apply helm:xref="{@id}">
-        <m:csymbol>and_ind</m:csymbol>
-        <xsl:apply-templates mode="noannot" select="*[6]"/>
-        <m:ci><xsl:value-of select="*[5]/target/@binder"/></m:ci>
-        <xsl:apply-templates mode="pure" select="*[5]/source/*"/>
-        <m:ci><xsl:value-of select="*[5]/target/LAMBDA/target/@binder"/></m:ci>
-        <xsl:apply-templates mode="pure" select="*[5]/target/LAMBDA/source/*"/>
-        <xsl:apply-templates mode="noannot" select="*[5]/target/LAMBDA/target/*"/>
-       </m:apply>
-      </xsl:when>
-      <xsl:when test="name()= 'APPLY' and CONST[
- attribute::uri='cic:/coq/INIT/Logic/Disjunction/or_ind.con'] 
- and count(child::*) = 7">
-       <m:apply helm:xref="{@id}">
-        <m:csymbol>or_ind</m:csymbol>
-        <xsl:apply-templates mode="noannot" select="*[7]"/>
-        <xsl:apply-templates mode="pure" select="//ALLTYPES/TYPE[@id=$id]"/>
-        <xsl:apply-templates mode="pure" select="*[5]"/>
-        <xsl:apply-templates mode="pure" select="*[6]"/>
-       </m:apply>
-      </xsl:when>
-      <xsl:when test="count(*[@id = //ALLTYPES/TYPE/@id]) = 1">
-       <m:apply helm:xref="{@id}">
-        <m:csymbol>thread</m:csymbol>
-        <xsl:apply-templates mode="pure" select="//ALLTYPES/TYPE[@id=$id]"/>
-        <m:apply>
-         <m:csymbol>app</m:csymbol>
-         <xsl:apply-templates mode="copy-of-no-prop" select="*[1]"/>
-        </m:apply>
-        <xsl:apply-templates mode="thread" select="*[@id = //ALLTYPES/TYPE/@id]"/>
-       </m:apply>
-      </xsl:when>
-      <xsl:otherwise>
-       <m:apply helm:xref="{@id}">
-        <m:csymbol>proof</m:csymbol>
-        <xsl:apply-templates select="." mode="pure"/>
-        <!-- <xsl:apply-templates select="key('typeid',@id)" mode="pure"/> -->
-        <xsl:apply-templates select="//ALLTYPES/TYPE[@id=$id]" mode="pure"/>
-       </m:apply>
-      </xsl:otherwise>
-     </xsl:choose>
-     </xsl:when>
-     <xsl:otherwise>
-      <xsl:apply-templates select="." mode="pure"/>
-     </xsl:otherwise>
-    </xsl:choose>
-   </xsl:when>
-   <xsl:otherwise>
-    <xsl:apply-templates select="." mode="pure"/>
-   </xsl:otherwise>
-  </xsl:choose>
+<!-- ALL this elements does not have inner type -->
+<xsl:template match="LETIN|PROD|REL|SORT|VAR|META|CONST|MUTIND|MUTCONSTRUCT" mode="noannot">
+<xsl:apply-templates select="." mode="pure"/>
 </xsl:template>
 
-<xsl:template match="*" mode="copy-of-no-prop">
+<!-- ALL ELEMENTS WITH A TYPE ARE TRANSLATED AS A PROOF-ELEMENT -->
+
+<!-- LAMBDA has inner type only if it is not nested inside another lambda -->
+<xsl:template match="LAMBDA" mode="noannot">
+ <xsl:variable name="id" select="@id"/>
  <xsl:choose>
-  <xsl:when test="@id = //ALLTYPES/TYPE/@id">
-   <m:ci>prev</m:ci>
+  <xsl:when test="$naturalLanguage='yes' and @sort='Prop' and name(../..) != 'LAMBDA'">
+   <m:apply helm:xref="{@id}">
+    <m:csymbol>proof</m:csymbol>
+    <xsl:apply-templates mode="proof_transform" select="."/>
+    <xsl:apply-templates mode="pure" select="$InnerTypes/InnerTypes/TYPE[@of=$id]/*"/>
+   </m:apply>
   </xsl:when>
   <xsl:otherwise>
    <xsl:apply-templates select="." mode="pure"/>
   </xsl:otherwise>
  </xsl:choose>
- <xsl:apply-templates mode="copy-of-no-prop" select="following-sibling::*[1]"/>
 </xsl:template>
 
-<xsl:template match="*" mode="thread">
-  <xsl:choose>
-   <xsl:when test="name()= 'APPLY' and CONST[
- attribute::uri='cic:/coq/INIT/Logic_Type/eqT_ind.con' or
- attribute::uri='cic:/coq/ZARITH/auxiliary/eqT_ind_r.con'] and count(child::*) = 7">
-    <xsl:variable name="id" select="@id"/>
-     <xsl:apply-templates mode="pure" select="//ALLTYPES/TYPE[@id=$id]"/>
+<!-- ALL these elements have inner type -->
+<xsl:template match="CAST|APPLY|MUTCASE|FIX|COFIX" mode="noannot">
+ <xsl:variable name="id" select="@id"/>
+ <xsl:choose>
+  <xsl:when test="$naturalLanguage='yes' and @sort='Prop'">
+   <m:apply helm:xref="{@id}">
+    <m:csymbol>proof</m:csymbol>
+    <xsl:apply-templates mode="proof_transform" select="."/>
+    <xsl:apply-templates mode="pure" select="$InnerTypes/InnerTypes/TYPE[@of=$id]/*"/>
+   </m:apply>
+  </xsl:when>
+  <xsl:otherwise>
+   <xsl:choose>
+    <xsl:when test="name()='APPLY'">
+     <xsl:apply-templates select="." mode="letin"/>
+    </xsl:when>
+    <xsl:otherwise>
+     <xsl:apply-templates select="." mode="pure"/>
+    </xsl:otherwise>
+   </xsl:choose>
+  </xsl:otherwise>
+ </xsl:choose>
+</xsl:template>
+
+<xsl:template mode="proof_transform" match="*">
+   <xsl:variable name="id" select="@id"/>
+   <xsl:choose>
+    <!-- NATIND 3 parametri -->
+    <xsl:when test="name()='APPLY' and CONST[
+ attribute::uri='cic:/Coq/Init/Datatypes/nat_ind.con'] and count(child::*) = 4">
      <m:apply>
-      <m:csymbol>rw_step</m:csymbol>
-      <xsl:apply-templates mode="pure" select="*[3]"/>
-      <xsl:apply-templates mode="pure" select="*[6]"/>
-      <xsl:apply-templates mode="pure" select="*[7]"/>
+      <m:csymbol>nat_ind</m:csymbol>
+      <xsl:apply-templates mode="noannot" select="*[3]"/>
+      <xsl:apply-templates mode="noannot" select="*[4]"/>
+     </m:apply>
+    </xsl:when>
+    <!-- NATIND 4 parametri -->
+    <xsl:when test="name()='APPLY' and CONST[
+ attribute::uri='cic:/Coq/Init/Datatypes/nat_ind.con'] and count(child::*) = 5">
+     <m:apply>
+      <m:csymbol>nat_ind</m:csymbol>
+      <xsl:apply-templates mode="noannot" select="*[3]"/>
+      <xsl:apply-templates mode="noannot" select="*[4]"/>
      </m:apply>
-     <xsl:apply-templates mode="thread" select="*[5]"/>
-   </xsl:when>
-<!--**** Patch temporanea, per il problema dei threads ***-->
-<xsl:when test="(name()= 'APPLY' and CONST[
- attribute::uri='cic:/coq/INIT/Logic/Conjunction/and_ind.con'] 
- and count(child::*) = 6) or
-(name()= 'APPLY' and CONST[
- attribute::uri='cic:/coq/INIT/Logic/Disjunction/or_ind.con'] 
- and count(child::*) = 7)">
- <xsl:apply-templates mode="noannot" select="."/>
-</xsl:when>
-<!--**** Fine Patch temporanea, per il problema dei threads ***-->
-   <xsl:when test="count(*[@id = //ALLTYPES/TYPE/@id]) = 1">
-       <xsl:variable name="id" select="@id"/>
-       <m:apply helm:xref="{@id}">
-        <m:csymbol>thread</m:csymbol>
-        <xsl:apply-templates mode="pure" select="//ALLTYPES/TYPE[@id=$id]"/>
+    </xsl:when>
+    <!-- EQUALITY -->
+    <xsl:when test="name()= 'APPLY' and CONST[
+ attribute::uri='cic:/Coq/Init/Logic/Equality/eq_ind.con' or
+ attribute::uri='cic:/Coq/Init/Logic_Type/eqT_ind.con' or
+ attribute::uri='cic:/Coq/Zarith/auxiliary/eqT_ind_r.con'] and count(child::*) = 7">
+      <m:apply>
+       <m:csymbol>rw_step</m:csymbol>
+       <xsl:apply-templates mode="noannot" select="*[5]"/>
+       <xsl:apply-templates mode="pure" select="*[3]"/>
+       <xsl:apply-templates mode="pure" select="*[6]"/>
+       <xsl:apply-templates mode="pure" select="*[7]"/>
+      </m:apply>
+    </xsl:when>
+    <!-- EQUALITY with extra-parameters -->
+    <xsl:when test="name()= 'APPLY' and CONST[
+ attribute::uri='cic:/Coq/Init/Logic_Type/eqT_ind.con' or
+ attribute::uri='cic:/Coq/Zarith/auxiliary/eqT_ind_r.con'] and count(child::*) > 7">
+      <xsl:variable name="no_extraproofs" select="count(*[position()>7 and @sort='Prop' and (name(.)='LAMBDA' or name(.)='LETIN' or name(.)='APPLY' or name(.)='MUTCASE' or name(.)='FIX' or name(.)='COFIX')])"/>      
+      <xsl:choose>
+       <xsl:when test="$no_extraproofs=0"> 
         <m:apply>
-         <m:csymbol>app</m:csymbol>
-         <xsl:apply-templates mode="copy-of-no-prop" select="*[1]"/>
+         <m:csymbol>rewrite_and_apply</m:csymbol>
+         <m:apply>
+          <m:csymbol>rw_step</m:csymbol>
+          <xsl:apply-templates mode="noannot" select="*[5]"/>
+          <xsl:apply-templates mode="pure" select="*[3]"/>
+          <xsl:apply-templates mode="pure" select="*[6]"/>
+          <xsl:apply-templates mode="pure" select="*[7]"/>
+         </m:apply>
+         <xsl:apply-templates mode="noannot" select="*[position()>7]"/>
         </m:apply>
-        <xsl:apply-templates mode="thread" select="*[@id = //ALLTYPES/TYPE/@id]"/>
-       </m:apply>
-   </xsl:when>
-   <xsl:otherwise>
-    <xsl:apply-templates mode="noannot" select="."/>
-   </xsl:otherwise>
-  </xsl:choose>
-</xsl:template>
-
-
-<!-- Basic proof operators -->
-
-<!-- non del tutto soddisfacente, ma .... -->
-<xsl:template match="APPLY[CONST[
- attribute::uri='cic:/coq/INIT/Logic_Type/eqT_ind.con' or
- attribute::uri='cic:/coq/ZARITH/auxiliary/eqT_ind_r.con']]" mode="appflat">
-    <xsl:choose>
-     <xsl:when test="count(child::*) > 7">
-      <xsl:variable name="id" select="@id"/>
-      <xsl:variable name="ideqp" select="*[7]/@id"/>
-      <xsl:variable name="idsubp" select="*[5]/@id"/>
-      <xsl:variable name="leteqp" select="boolean(//ALLTYPES/TYPE[@id=$ideqp])"/>
-      <xsl:variable name="letsubp" select="boolean(//ALLTYPES/TYPE[@id=$idsubp])"/>
-      <m:apply helm:xref="{@id}">
-       <m:csymbol>rewrite_and_apply</m:csymbol>
-       <m:apply>
-        <m:csymbol>rw_step</m:csymbol>
-        <xsl:apply-templates mode="pure" select="*[3]"/>
-        <xsl:apply-templates mode="pure" select="*[6]"/>
+       </xsl:when>
+       <xsl:otherwise>
         <xsl:choose>
-         <xsl:when test="$leteqp">
-          <xsl:choose>
-           <xsl:when test="$letsubp">
+         <xsl:when test="*[5]/@sort='Prop'">
+          <m:apply helm:xref="{@id}">
+           <m:csymbol>letin</m:csymbol>
+           <m:apply>
+            <m:csymbol>let</m:csymbol>
             <m:ci>
-             <xsl:value-of select="'h2'"/>
+             <xsl:call-template name="insert_subscript">
+              <xsl:with-param name="node_value" select="'h1'"/>
+             </xsl:call-template>
             </m:ci>
-           </xsl:when>
-           <xsl:otherwise>
-            <m:ci>
-             <xsl:value-of select="'h1'"/>
-            </m:ci>
-           </xsl:otherwise>
-          </xsl:choose>
+            <xsl:apply-templates mode="noannot" select="*[5]"/>
+           </m:apply>
+           <xsl:call-template name="gen_let">
+            <xsl:with-param name="init_pos" select="1"/>
+            <xsl:with-param name="from" select="7"/>
+           </xsl:call-template>
+           <m:apply>
+            <m:csymbol>rewrite_and_apply</m:csymbol>
+            <m:apply>
+             <m:csymbol>rw_step</m:csymbol>
+             <m:ci>
+              <xsl:call-template name="insert_subscript">
+               <xsl:with-param name="node_value" select="'h1'"/>
+              </xsl:call-template>
+             </m:ci>
+             <xsl:apply-templates mode="pure" select="*[3]"/>
+             <xsl:apply-templates mode="pure" select="*[6]"/>
+             <xsl:apply-templates mode="pure" select="*[7]"/>
+            </m:apply>
+            <xsl:apply-templates mode="flat" select="*[8]">
+             <xsl:with-param name="n">
+              <xsl:value-of select="2"/>
+             </xsl:with-param>
+            </xsl:apply-templates>
+           </m:apply>
+          </m:apply>
          </xsl:when>
          <xsl:otherwise>
-          <xsl:apply-templates mode="pure" select="*[7]"/>
+          <m:apply helm:xref="{@id}">
+           <m:csymbol>letin</m:csymbol>
+           <xsl:call-template name="gen_let">
+            <xsl:with-param name="init_pos" select="0"/>
+            <xsl:with-param name="form" select="7"/>
+           </xsl:call-template>
+           <m:apply>
+            <m:csymbol>rewrite_and_apply</m:csymbol>
+            <m:apply>
+             <m:csymbol>rw_step</m:csymbol>
+             <xsl:apply-templates mode="pure" select="*[5]"/>
+             <xsl:apply-templates mode="pure" select="*[3]"/>
+             <xsl:apply-templates mode="pure" select="*[6]"/>
+             <xsl:apply-templates mode="pure" select="*[7]"/>
+            </m:apply>
+            <xsl:apply-templates mode="flat" select="*[8]">
+             <xsl:with-param name="n">
+              <xsl:value-of select="1"/>
+             </xsl:with-param>
+            </xsl:apply-templates>
+           </m:apply>
+          </m:apply>
          </xsl:otherwise>
         </xsl:choose>
-       </m:apply>
+       </xsl:otherwise>
+      </xsl:choose>
+    </xsl:when>
+    <!-- gestire meglio il caso di and_ind quando la prova 
+         non e' della forma \x.\y.M -->
+    <xsl:when test="name()= 'APPLY' and CONST[
+ attribute::uri='cic:/Coq/Init/Logic/Conjunction/and_ind.con'] 
+ and count(child::*) = 6 
+ and name(*[5])='LAMBDA' 
+ and name(*[5]/target/*[1])='LAMBDA'"> 
+      <m:apply helm:xref="{@id}">
+       <m:csymbol>and_ind</m:csymbol>
+       <xsl:apply-templates mode="noannot" select="*[6]"/>
+       <m:ci><xsl:call-template name="insert_subscript"><xsl:with-param name="node_value"><xsl:value-of select="*[5]/target/@binder"/></xsl:with-param></xsl:call-template></m:ci>
+       <xsl:apply-templates mode="pure" select="*[5]/source/*"/>
+       <m:ci><xsl:call-template name="insert_subscript"><xsl:with-param name="node_value"><xsl:value-of select="*[5]/target/LAMBDA/target/@binder"/></xsl:with-param></xsl:call-template></m:ci>
+       <xsl:apply-templates mode="pure" select="*[5]/target/LAMBDA/source/*"/>
+       <xsl:apply-templates mode="proof_transform" select="*[5]/target/LAMBDA/target/*"/> 
+      </m:apply>
+    </xsl:when>
+    <xsl:when test="name()= 'APPLY' and CONST[
+ attribute::uri='cic:/Coq/Init/Logic/Disjunction/or_ind.con'] 
+ and count(child::*) = 7">
+     <m:apply helm:xref="{@id}">
+      <m:csymbol>or_ind</m:csymbol>
+      <xsl:apply-templates mode="noannot" select="*[7]"/>
+      <xsl:apply-templates mode="pure" select="$InnerTypes/InnerTypes/TYPE[@of=$id]/*"/>
+      <xsl:apply-templates mode="pure" select="*[5]"/>
+      <xsl:apply-templates mode="pure" select="*[6]"/>
+     </m:apply>
+    </xsl:when>
+    <!-- ex_ind, exT_ind -->
+      <xsl:when test="name()= 'APPLY' 
+ and (CONST[attribute::uri='cic:/Coq/Init/Logic_Type/exT_ind.con'] or
+      CONST[attribute::uri='cic:/Coq/Init/Logic/First_order_quantifiers/ex_ind.con'])  
+ and count(child::*) = 6 
+ and name(*[5])='LAMBDA' 
+ and name(*[5]/target/*[1])='LAMBDA'"> 
+      <m:apply helm:xref="{@id}">
+       <m:csymbol>ex_ind</m:csymbol>
+       <xsl:apply-templates mode="noannot" select="*[6]"/>
+       <m:ci><xsl:call-template name="insert_subscript"><xsl:with-param name="node_value"><xsl:value-of select="*[5]/target/@binder"/></xsl:with-param></xsl:call-template></m:ci>
+       <xsl:apply-templates mode="pure" select="*[5]/source/*"/>
+       <m:ci><xsl:call-template name="insert_subscript"><xsl:with-param name="node_value"><xsl:value-of select="*[5]/target/LAMBDA/target/@binder"/></xsl:with-param></xsl:call-template></m:ci>
+       <xsl:apply-templates mode="pure" select="*[5]/target/LAMBDA/source/*"/>
+       <xsl:apply-templates mode="proof_transform" select="*[5]/target/LAMBDA/target/*"/>
+      </m:apply>
+    </xsl:when>
+    <xsl:otherwise>
       <xsl:choose>
-       <xsl:when test="$letsubp">
-        <m:ci>
-         <xsl:value-of select="'h1'"/>
-        </m:ci>
+       <xsl:when test="name()='APPLY'">
+        <xsl:apply-templates select="." mode="letin"/>
        </xsl:when>
        <xsl:otherwise>
-        <xsl:apply-templates mode="pure" select="*[5]"/>
+        <xsl:apply-templates select="." mode="pure"/>
        </xsl:otherwise>
       </xsl:choose>
-      <xsl:apply-templates mode="flat" select="*[8]">
-       <xsl:with-param name="n">
-        <xsl:value-of select="1+$letsubp+$leteqp"/>
-       </xsl:with-param>
-      </xsl:apply-templates>
+    </xsl:otherwise>
+   </xsl:choose>
+</xsl:template>
+
+
+<xsl:template match="APPLY" mode="letin">
+   <xsl:variable name="no_subproofs" select="count(*[@sort='Prop' and (name(.)='LAMBDA' or name(.)='LETIN' or name(.)='APPLY' or name(.)='MUTCASE' or name(.)='FIX' or name(.)='COFIX')])"/>
+   <!-- <m:cn><xsl:value-of select="$no_subproofs"/></m:cn> -->
+   <xsl:choose>
+    <xsl:when test="$naturalLanguage='yes' and ($no_subproofs = 1)">
+     <m:apply helm:xref="{@id}">
+      <m:csymbol>letin1</m:csymbol>
+      <xsl:apply-templates mode="noannot" select="*[@sort='Prop' and (name(.)='LAMBDA' or name(.)='LETIN' or name(.)='APPLY' or name(.)='MUTCASE' or name(.)='FIX' or name(.)='COFIX')]"/>
+      <!-- now re-process the application -->
+      <m:apply helm:xref="{@id}">
+       <m:csymbol>app</m:csymbol>
+       <!-- mode previous looks for siblings: 
+            call with the first child -->
+       <xsl:apply-templates mode="previous" select="*[1]"/>
+      </m:apply>
      </m:apply>
     </xsl:when>
-    <xsl:otherwise>
+    <xsl:when test="$naturalLanguage='yes' and ($no_subproofs > 1)">
      <m:apply helm:xref="{@id}">
-      <m:csymbol>app</m:csymbol>
-      <xsl:apply-templates mode="flat" select="*[1]"/>
+      <m:csymbol>letin</m:csymbol>
+      <!-- first process all subproofs (let-in) -->
+      <xsl:call-template name="gen_let"/>
+      <!-- now re-process the application  -->
+      <m:apply helm:xref="{@id}">
+       <m:csymbol>app</m:csymbol>
+       <!-- mode flat looks for siblings: call with the first child -->
+       <xsl:apply-templates mode="flat" select="*[1]"/>
+      </m:apply>
      </m:apply>
+    </xsl:when>
+    <xsl:otherwise>
+     <xsl:apply-templates mode="pure" select="."/>
     </xsl:otherwise>
    </xsl:choose>
-</xsl:template> 
+</xsl:template>
+
+<xsl:template name="gen_let">
+ <xsl:param name="init_pos" select="0"/>
+ <xsl:param name="from" select="0"/>
+      <xsl:for-each select="*[position()>$from and @sort='Prop' and (name(.)='LAMBDA' or name(.)='LETIN' or name(.)='APPLY' or name(.)='MUTCASE' or name(.)='FIX' or name(.)='COFIX')]">
+       <m:apply>
+        <m:csymbol>let</m:csymbol>
+        <m:ci><xsl:call-template name="insert_subscript"><xsl:with-param name="node_value"><xsl:value-of select="concat('h',position()+$init_pos)"/></xsl:with-param></xsl:call-template></m:ci>
+        <xsl:apply-templates mode="noannot" select="."/>
+       </m:apply>
+      </xsl:for-each>
+</xsl:template>
+
+<xsl:template match="*" mode="previous">
+ <xsl:choose>
+  <xsl:when test="$naturalLanguage='yes' and(@sort='Prop' and (name(.)='LAMBDA' or name(.)='LETIN' or name(.)='APPLY' or name(.)='MUTCASE' or name(.)='FIX' or name(.)='COFIX'))">
+   <m:ci>previous</m:ci>
+  </xsl:when>
+  <xsl:otherwise>
+   <xsl:apply-templates select="." mode="pure"/>
+  </xsl:otherwise>
+ </xsl:choose>
+ <xsl:apply-templates mode="previous" select="following-sibling::*[1]"/>
+</xsl:template>
+
+<xsl:template match="*" mode="flat">
+ <xsl:param name="n" select="1"/>
+ <xsl:variable name="id" select="@id"/>
+ <xsl:choose>
+  <!-- <xsl:when test="key('typeid',@id)"> -->
+  <!-- <xsl:when test="$InnerTypes/InnerTypes/TYPE[@of=$id]"> -->
+  <xsl:when test="$naturalLanguage='yes' and @sort='Prop' and (name(.)='LAMBDA' or name(.)='LETIN' or name(.)='APPLY' or name(.)='MUTCASE' or name(.)='FIX' or name(.)='COFIX')">
+   <m:ci>
+    <xsl:call-template name="insert_subscript"><xsl:with-param name="node_value"><xsl:value-of select="concat('h',$n)"/></xsl:with-param></xsl:call-template>
+   </m:ci>
+   <xsl:apply-templates mode="flat" select="following-sibling::*[1]">
+    <xsl:with-param name="n" select="$n+1"/>
+   </xsl:apply-templates>
+  </xsl:when>
+  <xsl:otherwise>
+   <xsl:apply-templates mode="pure" select="."/>
+   <xsl:apply-templates mode="flat" select="following-sibling::*[1]">
+    <xsl:with-param name="n" select="$n"/>
+   </xsl:apply-templates>
+  </xsl:otherwise>
+ </xsl:choose>
+</xsl:template>
+
 
-<xsl:template match="APPLY[CONST[
- attribute::uri='cic:/coq/INIT/Logic/Conjunction/and_ind.con']]" mode="appflat">
+<!-- <xsl:template match="APPLY[CONST[
+ attribute::uri='cic:/Coq/Init/Logic/Conjunction/and_ind.con']]" mode="appflat">
     <xsl:choose>
      <xsl:when test="count(child::*) > 4">
       <m:apply helm:xref="{@id}">
@@ -243,7 +371,7 @@
       </m:apply>
      </xsl:otherwise>
     </xsl:choose>
-</xsl:template> 
+</xsl:template>  -->
 
 
 </xsl:stylesheet>