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- From: David Brownell <email@example.com>
- To: Danek Duvall <firstname.lastname@example.org>
- Date: Tue, 09 Nov 1999 00:16:00 -0800
> That is, say I have a file foo.xml that contains in it:
> blah, blah, blah &date; blah, blah, blah
> When I read it in on November 15, 1999, I want to get back
> blah, blah, blah November 15, 1999 blah, blah, blah
> I don't care that the token be &date; ; I just have to be able to say where
> the replaced tokens go.
> How can I do this, if at all, with SAX 1.0 and DOM 1.0 routines,
> specifically as implemented in Sun's Project-X (TR-2) parser?
Two ways come quickly to mind:
(1) <!ENTITY date SYSTEM "http://dateserver/servlet/getdate">
... and a servlet (or cgi or whatever) that expands
appropriately. Assumes a webserver is available,
but works with any (!) XML parser.
... with some processing componenent that knows how
to expand the 'builtin-date' PI. Assumes you provide
custom application code to handle this.
There's the suggestion in the XML spec that (2) be independant of
the actual PI name, perhaps
<!NOTATION builtin-date SYSTEM "urn:something-built-in">
and the processor keying on that SYSTEM id, so that "builtin-date"
could be anything. Of course, never build in anything as insecure
as an arbitrary shell escape; and have the processing component
that interprets those PIs generate no output except for a PI that's
inside the root element.
I'd likely use #2, as it's lower overhead.
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