Meta modeling is an effective approach to implement interoperability among distributed and heterogeneous information sources on Web. MMFI (Framework for Metamodel Interoperability) is a set of meta objects and Metamodel constructs to be used in the development a metamodel in actual implementation of information registry and repository. As a scalable solution to requirements of semantic interoperation between heterogeneous and autonomous Web services registries, we provide an ontological metamodeling approach to combine MMFI with technologies from the federated information management to create an architecture for Web services registry federation. A software component service registry prototype system implemented based on these methods is introduced.