Is prefer useful?

[Rob Lugt <roblugt@elcel.com>]

I have been trying to imagine a reason why I would ever want to code
prefer='system' in my catalogs, and can't come up with one.  Is it
superfluous?

I can see its usefulness in SGML where System Identifiers were optional, but
in XML everything except NotationDecls have to have a system identifier.
The effect of this is that all your public entries will be ignored when the
prefer value is "system", so why create them in the first place?

Am I missing something obvious?

Regards
Rob Lugt
ElCel Technology


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