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----- Original Message ----- 
From: "Norman Walsh" <ndw@n...>
To: <xml-dev@l...>
Sent: Wednesday, January 23, 2002 8:03 AM
Subject: Re:  Entity resolution vs. URI resolution


> ...
> 
> An entity is identified by an external identifier[3]. An external
> identifier is logically a tuple of (publicId, systemId). 

OR (the more typical branch of that production) is just a
singleton {systemId} ... which SAX has always represented
in the natural short hand {null, systemId} where "null" denotes
a non-existent systemId.






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