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----- Original Message -----
From: "Norman Walsh" <ndw@nwalsh.com>
To: <xml-dev@lists.xml.org>
Sent: Wednesday, January 23, 2002 8:03 AM
Subject: Re: [xml-dev] 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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