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Re: [xsl] things about grouping

Subject: Re: [xsl] things about grouping
From: Michael Kay <mike@xxxxxxxxxxxx>
Date: Sat, 24 Nov 2012 15:23:11 +0000

>3. If you group-starting-with it's weird to then see things not encompassed by the starting-with expression appear as a group because they precede the first occurrence of the starting-with expression. While this works as specified because for-each-group is a total function over the population it does result in a mismatch between the grammatical semantic and the exhibited behaviour, or to put it another way it does what it says in the spec but doesn't do what it says on the tin.

Finding element and attribute names that enable people to guess the semantics without reading the spec is not always easy. Som programming languages get around this by using operators like ~:< whose semantics you can't even attempt to guess...

The moral is, don't use any construct in any programming language without reading the spec.

Michael Kay

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