The Semantic Web has been gaining increasing attention, spurring a large number of initiatives to design and implement applications in this environment. This paper proposes an approach to specifying the user interface to such applications, as part of the Semantic Hypermedia Design Method. It proposes the use of an Abstract Interface Ontology, which is mapped onto application elements on one side and onto concrete interface elements specified as instances of a Concrete Interface Ontology. An implementation architecture, based on JSP and TagLibs is also proposed.