Link Type Hints

It was proposed off line recently that we can extend the link types resource to include information about what rdf:type(s) are expected on either end of a link. While not restrictive this information could be used by clients in user interfaces to suggest appropriate link types when a source resource is in context. When selecting the target end of a link it might be used to provide additional filtering (if not using delegated UI and using OSLC simple query instead).