Re: [xml-dev] Some Problems about Sax

["G. Ken Holman" <gkholman@CraneSoftwrights.com>]

At 2007-12-10 15:57 +0800, james jiang wrote:
>        I'am confused about the concept of SystemId and publicId in 
> sax. Could anyone tell me the difference between them and what they 
> exactly mean.

The system identifier is a reference to external resource.  When on 
the DOCTYPE, that resource is a parameter entity that defines the 
external declaration subset of either or both vocabulary constraints 
(element content models and attribute definitions) and entity replacement text.

The public identifier can only be specified in conjunction with the 
system identifier, not alone.  A processor looking for information 
from any external resource can choose to try and resolve the public 
identifier, or choose to ignore it and just use the system 
identifier.  The specification does not indicate how resolution is done.

Formally these are defined here:

   http://www.w3.org/TR/2006/REC-xml-20060816/#NT-ExternalID

I hope this helps.

. . . . . . . . . . . Ken


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