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Subject: SEP type registries and XRD self-descriptions
> -----Original Message----- > From: Barnhill, William [USA] [mailto:barnhill_william@bah.com] > > <snip> > > By the way, was a mechanism ever settled on how to register new service > endpoint types, or if such a registration process will exist? To my > knowledge the only registry is the wiki one at http://xrdstype.net/. Is > that the standard one at present? Bill, there's never been a formal mechanism for registering service endpoint types -- since they are URIs, it's inherently decentralized. http://xrdstype.net/ and the Wikipedia page for XRDS (http://en.wikipedia.org/wiki/XRDS) are the two "directories" I know of. > I ask as I'd like to register two service types: one for > resource-description, i.e. an endpoint that provides additional metadata > on the resource described by XRD, and one for self-description, i.e. an > endpoint that provides metadata on the enveloping XRD itself. What types of additional resource description do you have in mind? Are you thinking other formats (e.g., RDF, POWDER, XDI)? If so, I think that in the new XRD design those would just service endpoints with a MediaType (and no Type) element plus the URI at which that mediatype was available. Example: <XRD> <Service> <MediaType>application/rdf+xml</MediaType> <URI>http://example.com/some/rdf.xml</URI> </Service> </XRD> As for self-description, we talked about that at the F2F, and no service type should be needed for that because XRD discovery is recursive, i.e., since the XRD is itself a resource with a URI, you can do XRD discovery on that URI. For example, if the original URI on which are doing XRD discovery on is http://yahoo.com, and you discovery the URI of its XRD is http://yahoo.com/xrd, then to get XRD metadata on the XRD itself, you'd do XRD discovery on http://yahoo.com/xrd (which might lead you to a URI like http://yahoo.com/xrd/xrd - whatever template Yahoo uses). Hope this helps, =Drummond
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