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RE: AW: [xsl] Sorting Upper-Case first. Microsoft bug?
Subject: RE: AW: [xsl] Sorting Upper-Case first. Microsoft bug? From: "Michael Kay" <mhk@xxxxxxxxx> Date: Wed, 6 Aug 2003 08:39:07 +0100 |
> *It would be interesting to know how Saxon implements > this behaviour..* if M. Kay will be kind to answer.. > I thought you would never ask. I'm an optimist ;-) The answer is different for Saxon 6.x and Saxon 7.x. In Saxon 6.x, you can write your own collating functions as a plug-in, but if you don't, then two strings are compared as follows: 1. The two strings are compared with case normalized and accents stripped, using Unicode codepoint order of the normalized characters. 2. If step (1) finds that the strings are equal, they are compared with case normalized but without accents stripped, again using codepoint order. 3. If step (2) finds that the strings are equal, the outcome depends on the case of the first character that differs in the two strings, taking account of the case-order option on xsl:sort. Case normalization relies on the Java method toLowerCase. Accent stripping is implemented only for characters in the upper half of the Latin-1 set. The above is essentially a simplified implementation of the Unicode Collation Algorithm. In Saxon 7.x, Saxon uses the collation capabilities of JDK 1.4. You can select any collation supported by the JDK. The default is selected according to your locale, or according to the language if lang is specified on xsl:sort. If case-order is upper-first, then the action of the selected Java collation is modified as follows: if the Java collation decides that two strings collate as equal, then Saxon examines the two strings, looking for the first character that differs between the two strings. If one of these is upper case, then that string comes first in the sorted order. Michael Kay XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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