The SADI Plug-in to the IO Informatics Knowledge Explorer. In this image, we have selected a node on the canvas representing UniProt protein P09416 and a right-click has raised the SADI Plug-in menu. The menu is derived by requesting the rdf:type information for the selected node, and then searching the SADI registry for all Semantic Web Services that consume that data class. From the discovered services, the RDF predicates that are created by those services are then displayed in the menu for the user to select. Clicking "GO" invokes the selected services and the returned data is added to the graph on the canvas.