Add dictionary of includes to schema instance.
           schema -- XMLSchema instance

def __setIncludes(self, schema):
        """Add dictionary of includes to schema instance.
           schema -- XMLSchema instance
        """
        for schemaLocation, val in schema.includes.items(): 
            if self._includes.has_key(schemaLocation):
                schema.addIncludeSchema(schemaLocation, self._imports[schemaLocation])