What is a "Public Identifier"?

[Mike_Spreitzer.PARC at xerox.com]

I'm wondering if there is any standardization of what's in a "public
identifier" and/or of how one is resolved to whatever it refers to.  The XML
1.0 spec has very little to say about this (unless I've overlooked something)
--- it only says that white space should be normalized before attempting to
resolve.  Yet there is a lot of regularity in the examples I see.  I've never
seen anything specifying the structure used.  What am I missing?

Thanks,
Mike

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