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diff --git a/docs/tool/Modules/NaturalDocs/SourceDB/ItemDefinition.pm b/docs/tool/Modules/NaturalDocs/SourceDB/ItemDefinition.pm
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+###############################################################################
+#
+#   Package: NaturalDocs::SourceDB::ItemDefinition
+#
+###############################################################################
+#
+#   A base class for all item definitions for extensions that track more than existence.
+#
+###############################################################################
+
+# This file is part of Natural Docs, which is Copyright (C) 2003-2008 Greg Valure
+# Natural Docs is licensed under the GPL
+
+use strict;
+use integer;
+
+
+package NaturalDocs::SourceDB::ItemDefinition;
+
+
+#
+#   Function: Compare
+#
+#   Returns whether the definitions are equal.  This version returns true by default, you must override it in your subclasses
+#   to make the results relevant.  This is important for <NaturalDocs::SourceDB->AnalyzeTrackedFileChanges()>.
+#
+#   This will only be called between objects of the same <ExtensionID>.  If you use multiple derived classes for the same
+#   <ExtensionID>, you will have to take that into account yourself.
+#
+#   Parameters:
+#
+#       other - Another <NaturalDocs::SourceDB::ItemDefinition>-derived object to compare this one to.  It will always be from
+#                  the same <ExtensionID>.
+#
+#   Returns:
+#
+#       Whether they are equal.
+#
+sub Compare #(other)
+    {
+    return 1;
+    };
+
+
+1;