- From: Mark Baker <distobj@acm.org>
- Date: Mon, 25 Mar 2002 15:20:39 -0500 (EST)
- To: www-xml-schema-comments@w3.org
Hi, I became aware of an issue while following www-tag, as relayed by David Orchard[1] from Joseph Reagle's initial post[2], and elaborated upon by Noah Mendelsohn[3]. I agree with Norm Walsh when he said[4] that, without knowledge of a specific URI scheme, an agent performing a comparison can only rely on lexicographic equivalence. This seems quite fundamental to me. Noah said[3]; The question is, if I build a subtype of anyUri that accepts only: "http://www.ibm.com" will it also accept uppercase? I believe that the answer is "no", because an enumeration is a generic means of limitation, and has no built-in notion of equivalence, or of messing with the equivalence semantics of the parent type. So, an instance of the aforementioned anyURI subtype would be considered equivalent to the URI "http://www.IBM.com". [1] http://lists.w3.org/Archives/Public/www-tag/2002Mar/0111 [2] http://lists.w3.org/Archives/Public/www-tag/2002Feb/0129 [3] http://lists.w3.org/Archives/Public/www-tag/2002Mar/0126 [4] http://lists.w3.org/Archives/Public/www-tag/2002Mar/0157 MB -- Mark Baker, Chief Science Officer, Planetfred, Inc. Ottawa, Ontario, CANADA. mbaker@planetfred.com http://www.markbaker.ca http://www.planetfred.com
Received on Monday, 25 March 2002 15:15:30 UTC