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> From: John Cowan [mailto:firstname.lastname@example.org]
> > So public ids are
> > only useful if the system identifier isn't available.
> Not so. A system identifier matches only if there is a system, rewriteSystem,
> or delegateSystem entry in the catalog. So if there are none of these,
> then as long as prefer="public" is set (which it should always be), then
> public, rewritePublic, and delegatePublic rules are applied.
Of course, yes. That was staring me in the face.
> There are two cases in which a public id can exist without a system id:
> in a NOTATION declaration, and after delegating to a new catalog via
> delegatePublic (in which case the original system id is discarded).
I'd missed this also. Is there any particular reason why the system id is
discarded, or is this another hold-over from TR9401?