• To: "John Cowan" <jcowan@r...>
• Subject: RE: XML Catalogs and Public Ids
• From: "Leigh Dodds" <ldodds@i...>
• Date: Tue, 21 Jan 2003 16:21:33 -0000
• Cc: "xml-dev" <xml-dev@l...>
• Importance: Normal
• In-reply-to: <200301211611.LAA04386@m...>

Hi John,

> From: John Cowan [mailto:jcowan@r...]
...
> > 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?

Cheers,

L.

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