code: def resolve(self, nobuiltin=False):
          
          cached = self.resolved_cache.get(nobuiltin)
          if cached is not None:
              return cached
          resolved = self.__resolve_type(nobuiltin)
          self.resolved_cache[nobuiltin] = resolved
          return resolved
docs: Resolve the node's type reference and return the referenced type node.
  
          Returns self if the type is defined locally, e.g. as a <complexType>
          subnode. Otherwise returns the referenced external node.
  
          @param nobuiltin: Flag indicating whether resolving to XSD built-in
              types should not be allowed.
          @return: The resolved (true) type.
          @rtype: L{SchemaObject}