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   Re: Are PI targets arbitrary?

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  • From: james anderson <James.Anderson@mecomnet.de>
  • To: XML-Dev Mailing list <xml-dev@ic.ac.uk>
  • Date: Mon, 25 Jan 1999 16:52:29 +0100

One way in which this differs from namespaces is that it does not provide a
mechanism to avoid name conflicts. A consistently applied encoding mechanism
for namespaces would have. That is, the ns-spec should well have premitted all
names to be qualified names. Since it precludes the name in a notation from
being qualified, it is not possible to use notation to this end. I have heard
the argument, that the association with a notation and the uri specification
for a notation obviates the need for qualification. It didn't understand the
claim. I still don't.

One really needs to an encoding of the form
<?pi fop:some-command some args ?>

which together with the binding < ... xmlns:fop="http://www.jtauber.com/fop/"
... >
would permit the application to operate with a token of the form
 ("http://www.jtauber.com/fop/" X "some-command")
and be assured that there are no name conflicts.

Yes, the present spec would permit this, but does not describe its effect.

James Tauber wrote:
> I'm starting to put some options into FOP that are triggered by processing
> instructions. My initial thought was use 'fop' as the target.
> But then it occurred to me: PI targets can be associated with a URI via a
> NOTATION declaration. This is *a lot* like namespaces. Does that mean PI
> targets should be arbitrary proxies?
> Instead of looking for PIs with the target "fop" should I instead be looking
> for PIs with the target which is a NOTATION declared with URI
> http://www.jtauber.com/fop/
> After all, some other application might use the target "fop" but only mine
> would use the NOTATION with URI http://www.jtauber.com/fop/.

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