yadis:xrds_specified_location/2

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Predicate xrds_specified_location/2

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yadis:xrds_specified_location(+Server, -XRDSLocation)[multifile, 'openid.pl']

Hacks to deal with broken Yadis support.

Google does not support Yadis discovery, but does have an XRSD document, so we fake its location.
stackexchange.com serves an OP Identifier Element instead of an Claimed Identifier Element when doing Yadis discovery on the real OpenID.