The Web Services Framework provides techniques to enable the application-to-application use of the Web. It has the potential of becoming the core of a new Web-based middleware platform, providing interoperability between computational services using Web- and Internet-technologies. Security is of course of major importance in this context. We introduce here extensions to two major building blocks of the Web Services Framework – the Web Services Description Language WSDL and the Universal Description, Discovery, and Integration Service UDDI. We add description mechanisms and matching techniques that support the retrieval of Web Services from repositories.