RE: [xri] Possibly a small error an XRD Schema.

John Bradley wrote on 2009-10-28:
> Allowing 0 allows for a error to be returned at the XRDS level without
> having to create a dummy XRD.

That was what I thought we concluded during one of the calls, though
obviously I didn't notice that the spec said otherwise. Sorry for missing
that.

-- Scott