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   Re: FPIs and case sensitivity

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  • From: Paul Grosso <pgrosso@arbortext.com>
  • To: XML-Dev Mailing list <xml-dev@xml.org>
  • Date: Tue, 05 Sep 2000 13:15:38 -0500

At 10:09 2000 09 05 -0400, Simon St.Laurent wrote:
>Are FPIs supposed to be case sensitive?

Yes, they are.

>I seem to remember that they're not, but the one clear piece I've found
>suggests otherwise:
>Norm Walsh's excellent piece doesn't say explicitly that they are
>case-sensitive, but it looks like they are:

Yep, Norm got it right. 

>I can't seem to find anything on the OASIS site, and TR9401 returns 404:

I guess that site is still broken, but I've got the original source
for TR9401.  However, it doesn't say anything about this, because FPIs
(and public identifiers in general) are defined in ISO 8879 (and ISO 9070).  

FPIs are a subset of public identifiers, and all public identifiers
are minimum literals (8879 clause 10.1.7) which are case sensitive.
(Though the productions differ slightly, the same conclusion holds
for XML.)  Note that there is a "normalization" process (though it
is not called that in 8879) for minimum literals which compresses
whitespace, but it does not affect letter case.



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