Subject: [xsl] Function for determining one XPath as subset of another From: "Adam Retter adam.retter@xxxxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Tue, 26 Jan 2016 16:15:05 -0000 |
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
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