diff --git a/Utility.py b/Utility.py
index bad8210..ac409b6 100755
--- a/Utility.py
+++ b/Utility.py
@@ -555,10 +555,12 @@ DOM = DOM()
 
 class Collection(UserDict):
     """Helper class for maintaining ordered named collections."""
-    def __init__(self, parent):
+    default = lambda k: k.name
+    def __init__(self, parent, key=Collection.default):
         UserDict.__init__(self)
         self.parent = weakref.ref(parent)
         self.list = []
+        self._func = key
 
     def __getitem__(self, key):
         if type(key) is type(1):
@@ -571,10 +573,10 @@ class Collection(UserDict):
         self.data[key] = item
 
     def keys(self):
-        return map(lambda i: i.name, self.list)
+        return map(lambda i: self._func(i), self.list)
 
     def items(self):
-        return map(lambda i: (i.name, i), self.list)
+        return map(lambda i: (self._func(i), i), self.list)
 
     def values(self):
         return self.list
diff --git a/XMLSchema.py b/XMLSchema.py
index 7777bec..712efa1 100755
--- a/XMLSchema.py
+++ b/XMLSchema.py
@@ -718,14 +718,15 @@ class XMLSchema(XMLSchemaComponent):
         """
         self.targetNamespace = None
         XMLSchemaComponent.__init__(self, parent)
-        self.includes = Collection(self)
-        self.imports = Collection(self)
-        self.elements = Collection(self)
-        self.types = Collection(self)
-        self.attr_decl = Collection(self)
-        self.attr_groups = Collection(self)
-        self.model_groups = Collection(self)
-        self.notations = Collection(self)
+        f = lambda k: k.attributes['name']
+        self.includes = Collection(self, key=f)
+        self.imports = Collection(self, key=f)
+        self.elements = Collection(self, key=f)
+        self.types = Collection(self, key=f)
+        self.attr_decl = Collection(self, key=f)
+        self.attr_groups = Collection(self, key=f)
+        self.model_groups = Collection(self, key=f)
+        self.notations = Collection(self, key=f)
 
         self._imported_schemas = {}
         self._included_schemas = {}