Subject: Re: [xsl] things about grouping From: Ihe Onwuka <ihe.onwuka@xxxxxxxxx> Date: Thu, 29 Nov 2012 09:08:24 +0000 |
>>>> ok but I'm translating , into a set-theoretic construct, in which >>>> domain a,b is indistinct from a|b - correct me if I have got that >>>> wrong. >>> >>> sorry you mean the deduping........ >>> >>> well you are no longer dealing in sets ...... so if you apply a >>> set-theoretic construct then all bets are off and the law of the >>> jungle applies. >> >> or to put it another way that is as much type abuse as applying a >> numeric operator to a string and for that reason I would walk away >> from such expressions. > > unless the , operator results in a relation rather than a set but then > I'd have to refer to my discrete math text and parse the effect of a > set-theoretic difference operation on a relation if indeed that is > valid thing to do. sorry above should read bag not relation. Same caveats apply. The point is there is virtue in parsing a construct in the syntax and semantics of it's original domain esp when it is well defined and supported by axioms, in preference to parsing in terms of a programming language specification that may lack those qualities.
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