Subject: RE: [xsl] Re: XPath incompatibilities From: Joerg Pietschmann <joerg.pietschmann@xxxxxx> Date: Thu, 03 Jan 2002 17:23:45 +0100 |
"Michael Kay" <michael.h.kay@xxxxxxxxxxxx> wrote: > (Another > option that's on the table is that we never interpret "<" as a lexicographic > comparison, forcing the user to use the compare() function instead, or > perhaps the new "lt" operator.). Just my 2 cents: - Overloading operators (and functions) too much is not a good idea, especially if some of the overloaded semantics is not as widely used as others (counting other contextes as well). While using "<" for numeric comparisions seems to be commonplace, i don't recall that it is widely used for string comparisions (even the C++ standard libraries don't do that). I'd like to see a compare() function, especially because such a function is needed anyway for additional parameters in case you want to specify a locale or language or such which influences the comparision. - Keep the number of operators small. Operators have to be in the grammar, and grammars aren't that easy to keep modular. Keeping the grammar small by using operator precendences and association rules doesn't avoid the problem, these tables aren't that easy to keep modular either. Functions are much easier to separate into different modules/packages/whatever. - Don't overuse operators consisting of letters, even (or especially) if they are words. There is a lot of potential of having them confused with other names (unless you make them completely reserved identifiers, hardly an option here). Especially don't invent a "lt" operator, or any other operator with the same name as one of the auto-predefined XML entities (unless you want to answer all the newbie questions why they sometimes have to write "<" and sometimes "lt" to avoid runtime errors... :-) Regards J.Pietschmann XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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