Gabe,
Good catch. Since xri-segment can already contain an xref, we had the
case of "xri:@(xref).foo.bar" covered, and the case where the authority
segment is an xref alone ("xri:(xref)/foo.bar"), but not the case where
the authority begins with an xref and has delegated sub-segments
("xri:(xref).foo.bar").
However I see one problem with:
XRI-authority = (gcs-char / xref) xri-segment
It's that a gcs-char can be following directly by a reassignable
identifier (e.g., @foo), whereas an xref is itself a sub-segment, so it
must be delimited from the next sub-segment by a dot or a colon.
So I think what we'll need is:
authority-part = URI-authority / XRI-authority
XRI-authority = ( gcs-char xri-segment ) / xref-segment
xref-segment = xref ( "." sub-segment / ":" sub-segment)
*( "." sub-segment / ":" sub-segment)
Please check my logic.
