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diff --git a/docs/tool/Modules/NaturalDocs/SourceDB/Item.pm b/docs/tool/Modules/NaturalDocs/SourceDB/Item.pm
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+###############################################################################
+#
+#   Package: NaturalDocs::SourceDB::Item
+#
+###############################################################################
+#
+#   A base class for something being tracked in <NaturalDocs::SourceDB>.
+#
+###############################################################################
+
+# 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::Item;
+
+use NaturalDocs::DefineMembers 'DEFINITIONS';
+
+
+#
+#   Variables: Members
+#
+#   The following constants are indexes into the object array.
+#
+#   DEFINITIONS - A hashref that maps <FileNames> to either <NaturalDocs::SourceDB::ItemDefinition>-derived objects or
+#                         serves as an existence hashref depending on whether the extension only tracks existence.  Will be undef if
+#                         there are none.
+#
+
+
+#
+#   Function: New
+#
+#   Creates and returns a new object.
+#
+sub New
+    {
+    my $class = shift;
+
+    my $object = [ ];
+    bless $object, $class;
+
+    return $object;
+    };
+
+
+
+###############################################################################
+#
+#   Group: Definition Functions
+#
+#   These functions should be called by <NaturalDocs::SourceDB>.  You should not be calling them directly.  Call functions
+#   like <NaturalDocs::SourceDB->AddDefinition()> instead.
+#
+
+
+#
+#   Function: AddDefinition
+#
+#   Adds a definition for the passed <FileName>.  If it's already defined, the new definition will be ignored.
+#
+#   Parameters:
+#
+#       file - The <FileName>.
+#       definition - The definition, which must be an object derived from <NaturalDocs::SourceDB::ItemDefinition> or undef if
+#                       the extension only tracks existence.
+#
+#   Returns:
+#
+#       Whether the definition was added, which is to say, whether this was the first definition for the passed <FileName>.
+#
+sub AddDefinition #(FileName file, optional NaturalDocs::SourceDB::ItemDefinition definition) => bool
+    {
+    my ($self, $file, $definition) = @_;
+
+    if (!defined $self->[DEFINITIONS])
+        {  $self->[DEFINITIONS] = { };  };
+
+    if (!exists $self->[DEFINITIONS]->{$file})
+        {
+        if (!defined $definition)
+            {  $definition = 1;  };
+
+        $self->[DEFINITIONS]->{$file} = $definition;
+        return 1;
+        }
+    else
+        {  return 0;  };
+    };
+
+
+#
+#   Function: ChangeDefinition
+#
+#   Changes the definition for the passed <FileName>.
+#
+#   Parameters:
+#
+#       file - The <FileName>.
+#       definition - The definition, which must be an object derived from <NaturalDocs::SourceDB::ItemDefinition>.
+#
+sub ChangeDefinition #(FileName file, NaturalDocs::SourceDB::ItemDefinition definition)
+    {
+    my ($self, $file, $definition) = @_;
+
+    if (!defined $self->[DEFINITIONS] || !exists $self->[DEFINITIONS]->{$file})
+        {  die "Tried to change a non-existant definition in SourceD::Item.";  };
+
+    $self->[DEFINITIONS]->{$file} = $definition;
+    };
+
+
+#
+#   Function: GetDefinition
+#
+#   Returns the <NaturalDocs::SourceDB::ItemDefinition>-derived object for the passed <FileName>, non-zero if it only tracks
+#   existence, or undef if there is no definition.
+#
+sub GetDefinition #(FileName file) => NaturalDocs::SourceDB::ItemDefinition or bool
+    {
+    my ($self, $file) = @_;
+
+    if (defined $self->[DEFINITIONS])
+        {  return $self->[DEFINITIONS]->{$file};  }
+    else
+        {  return undef;  };
+    };
+
+
+#
+#   Function: DeleteDefinition
+#
+#   Removes the definition for the passed <FileName>.  Returns whether it was successful, meaning whether a definition existed
+#   for that file.
+#
+sub DeleteDefinition #(FileName file) => bool
+    {
+    my ($self, $file) = @_;
+
+    if (defined $self->[DEFINITIONS])
+        {
+        if (exists $self->[DEFINITIONS]->{$file})
+            {
+            delete $self->[DEFINITIONS]->{$file};
+
+            if (!scalar keys %{$self->[DEFINITIONS]})
+                {  $self->[DEFINITIONS] = undef;  };
+
+            return 1;
+            };
+        };
+
+    return 0;
+    };
+
+
+#
+#   Function: HasDefinitions
+#
+#   Returns whether there are any definitions for this item.
+#
+sub HasDefinitions # => bool
+    {
+    my $self = shift;
+    return (defined $self->[DEFINITIONS]);
+    };
+
+
+#
+#   Function: HasDefinition
+#
+#   Returns whether there is a definition for the passed <FileName>.
+#
+sub HasDefinition #(FileName file) => bool
+    {
+    my ($self, $file) = @_;
+
+    if (defined $self->[DEFINITIONS])
+        {  return (exists $self->[DEFINITIONS]->{$file});  }
+    else
+        {  return 0;  };
+    };
+
+
+#
+#   Function: GetAllDefinitionsHashRef
+#
+#   Returns a hashref of all the definitions of this item.  *Do not change.*  The keys are the <FileNames>, and the values are
+#   either <NaturalDocs::SourceDB::ItemDefinition>-derived objects or it's just an existence hashref if those aren't used.
+#
+sub GetAllDefinitionsHashRef
+    {
+    my $self = shift;
+    return $self->[DEFINITIONS];
+    };
+
+
+1;