diff --git a/lib/mako/codegen.py b/lib/mako/codegen.py
index ff801a58c05a33d363d292a8fe714126bfc56fa5..fb54df176515141d830415a94dcd59600e90eb1a 100644
--- a/lib/mako/codegen.py
+++ b/lib/mako/codegen.py
@@ -206,7 +206,7 @@ class _GenerateRenderMethod(object):
 
     def visitIncludeTag(self, node):
         self.write_source_comment(node)
-        self.printer.writeline("runtime.include_file(context, %s, import_symbols=%s)" % (repr(node.attributes['file']), repr(node.attributes.get('import', False))))
+        self.printer.writeline("runtime.include_file(context, %s, import_symbols=%s)" % (node.parsed_attributes['file'], repr(node.attributes.get('import', False))))
 
     def visitNamespaceTag(self, node):
         self.write_source_comment(node)
@@ -222,7 +222,7 @@ class _GenerateRenderMethod(object):
             n.accept_visitor(vis)
         self.printer.writeline("return [%s]" % (','.join(export)))
         self.printer.writeline(None)
-        self.printer.writeline("%s = runtime.Namespace(%s, context.clean_inheritance_tokens(), templateuri=%s, callables=make_namespace())" % (node.name, repr(node.name), repr(node.attributes['file'])))
+        self.printer.writeline("%s = runtime.Namespace(%s, context.clean_inheritance_tokens(), templateuri=%s, callables=make_namespace())" % (node.name, repr(node.name), node.parsed_attributes['file']))
         
     def visitComponentTag(self, node):
         pass
@@ -334,8 +334,7 @@ class _Identifiers(object):
             for n in node.nodes:
                 n.accept_visitor(self)
     def visitIncludeTag(self, node):
-        # TODO: expressions for attributes
-        pass        
+        self.check_declared(node)
     def visitNamespaceTag(self, node):
         self.check_declared(node)
         if node is self.node:
diff --git a/lib/mako/parsetree.py b/lib/mako/parsetree.py
index 5f49ae768839aa41d3b4c39d2fe688290adac404..fece1af98a15492ede16adbb2b720a5be3bb45f0 100644
--- a/lib/mako/parsetree.py
+++ b/lib/mako/parsetree.py
@@ -192,8 +192,8 @@ class Tag(Node):
                 for x in re.split(r'(\${.+?})', self.attributes[key]):
                     m = re.match(r'^\${(.+?)}$', x)
                     if m:
-                        #code = ast.PythonCode(m.group(1), self.lineno, self.pos)
-                        #undeclared_identifiers = undeclared_identifiers.union(code.undeclared_identifiers)
+                        code = ast.PythonCode(m.group(1), self.lineno, self.pos)
+                        undeclared_identifiers = undeclared_identifiers.union(code.undeclared_identifiers)
                         expr.append(m.group(1))
                     else:
                         expr.append(repr(x))
@@ -203,7 +203,12 @@ class Tag(Node):
                     raise exceptions.CompileException("Attibute '%s' in tag '%s' does not allow embedded expressions"  %(key, self.keyword), self.lineno, self.pos)
                 self.parsed_attributes[key] = repr(self.attributes[key])
             else:
-                raise exceptions.CompileException("Invalid attribute for tag '%s': '%s'" %(self.keyword, key), self.lineno, self.pos)        
+                raise exceptions.CompileException("Invalid attribute for tag '%s': '%s'" %(self.keyword, key), self.lineno, self.pos)
+        self.expression_undeclared_identifiers = undeclared_identifiers
+    def declared_identifiers(self):
+        return []
+    def undeclared_identifiers(self):
+        return self.expression_undeclared_identifiers
     def __repr__(self):
         return "%s(%s, %s, %s, %s)" % (self.__class__.__name__, repr(self.keyword), repr(self.attributes), repr((self.lineno, self.pos)), repr([repr(x) for x in self.nodes]))
         
@@ -219,8 +224,6 @@ class NamespaceTag(Tag):
         self.name = attributes['name']
     def declared_identifiers(self):
         return [self.name]
-    def undeclared_identifiers(self):
-        return []
         
 class ComponentTag(Tag):
     __keyword__ = 'component'
diff --git a/test/inheritance.py b/test/inheritance.py
index ccd9b155a34bb7a66afa05341ecbf9ef6c9280ce..0df7ef0ad48f26e0f526eaf544b5030129086b64 100644
--- a/test/inheritance.py
+++ b/test/inheritance.py
@@ -95,7 +95,6 @@ ${next.body()}
         <%inherit file="base"/>
         this is index.
         a is: ${self.a()}
-        
         <%include file="secondary"/>
 """)
 
@@ -105,6 +104,7 @@ ${next.body()}
         a is: ${self.a()}
 """)
 
+        print collection.get_template("index").code
         print collection.get_template("index").render()
 
     def test_namespaces(self):
@@ -124,7 +124,7 @@ ${next.body()}
         collection.put_string("layout", """
         <html>
             <%inherit file="base"/>
-            <%component name="a">layout_a</%component>
+            <%component name="a()">layout_a</%component>
             This is the layout..
             ${next.body()}
         </html>
@@ -137,13 +137,17 @@ ${next.body()}
         a is: ${self.a()}
         sc.a is: ${sc.a()}
         sc.b is: ${sc.b()}
+        sc.c is: ${sc.c()}
+        sc.body is: ${sc.body()}
 """)
 
         collection.put_string("secondary","""
         <%inherit file="layout"/>
-        <%component name="c">secondary_c.  a is ${self.a()} b is ${self.b()}</%component>
+        <%component name="c">secondary_c.  a is ${self.a()} b is ${self.b()} d is ${self.d()}</%component>
+        <%component name="d">secondary_d.</%component>
         this is secondary.
         a is: ${self.a()}
+        c is: ${self.c()}
 """)
         print collection.get_template('index').render()