Define a general entity "&version;" that can be used as the current major

version of the Python interpreter.  This is \version in the LaTeX format
of the documentation.

Doc/sgml/catalog

+-- SGML-Open-style catalog for the Python documentation system --
+
 CATALOG	"iso/catalog"
 CATALOG	"oasis/catalog"
 
 PUBLIC  "+//IDN python.org//DTD Python Documentation 1.0//EN" "python.dtd"
+PUBLIC  "+//IDN python.org//ENTITIES Python Version//EN" "version.ent"

Doc/sgml/python.dtd

@@ -7,6 +7,11 @@
 	  PUBLIC "-//OASIS//DTD Exchange Table Model 19960430//EN">
 &oasis-tables.mod;
 
+<!-- define the &version; general entity -->
+<!ENTITY python-version.ent
+	  PUBLIC "+//IDN python.org//ENTITIES Python Version//EN">
+&python-version.ent;
+
 <!ELEMENT input - - EMPTY>
 <!ATTLIST input
 	  %common.att;

Doc/sgml/version.ent

+<!-- Version number for the Python interpreter -->
+<!ENTITY version CDATA "1.5">