PublicShow sourceyadis.pl -- Yadis discovery

See also
- http://en.wikipedia.org/wiki/Yadis
Source xrds_dom(+Id, -XRDS_DOM) is det
True when XRDS_DOM is a parsed XML document for the given resource.
Source xrds_location(+Id, -XRDSLocation) is semidet
Discover the location of the XRDS document from the given Id.