Subject: Re: [xsl] Function for determining one XPath as subset of another From: "Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Tue, 26 Jan 2016 17:19:13 -0000 |
I don't expect this to be possible without knowing the two complete evaluation contexts -- and of course, not only their static components. > My goal here is given any two simple arbitrary XPaths expressed as > strings, and without evaluating them against a context, to determine > whether one would return a subset of the results of the other. > Cheers, Dimitre On Tue, Jan 26, 2016 at 8:15 AM, Adam Retter adam.retter@xxxxxxxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > Given two simple XPaths, say: > > 1. //w > > 2. /x/y/z/w[@a = 'v'] > > As a human I can very easily tell without evaluating the expressions > that (2) will return a subset (or the same set) of the results that > (1) would return *should* they both be evaluated. > > My goal here is given any two simple arbitrary XPaths expressed as > strings, and without evaluating them against a context, to determine > whether one would return a subset of the results of the other. > > I wondered if there might be an algorithm or library that someone > already had or has written which might be able to give me the answer? > > I realise that I can only probably cover a subset of XPath itself, but > it is only the path steps with predicates which I am interested in. > > Ideally I am looking for something in Java. > > -- > Adam Retter > > skype: adam.retter > tweet: adamretter > http://www.adamretter.org.uk > -- Cheers, Dimitre Novatchev --------------------------------------- Truly great madness cannot be achieved without significant intelligence. --------------------------------------- To invent, you need a good imagination and a pile of junk ------------------------------------- Never fight an inanimate object ------------------------------------- To avoid situations in which you might make mistakes may be the biggest mistake of all ------------------------------------ Quality means doing it right when no one is looking. ------------------------------------- You've achieved success in your field when you don't know whether what you're doing is work or play ------------------------------------- To achieve the impossible dream, try going to sleep. ------------------------------------- Facts do not cease to exist because they are ignored. ------------------------------------- Typing monkeys will write all Shakespeare's works in 200yrs.Will they write all patents, too? :) ------------------------------------- Sanity is madness put to good use. ------------------------------------- I finally figured out the only reason to be alive is to enjoy it.
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