Subject: Re: [xsl] XPath for expressing contiguous elements? From: "Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Mon, 1 May 2017 18:43:00 -0000 |
And here is an XPath 2.0 expression: empty(/*/B[. >> /*/A[1] and /*/A[last()] >> .]) On Mon, May 1, 2017 at 5:59 AM, Costello, Roger L. costello@xxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > Hi Folks, > > I want an XPath expression that implements this rule: > > All <A> elements shall be contiguous within <Test>. > > In this example all A's are contiguous, so the rule is satisfied: > > <Test> > <B/> > <A/> > <A/> > <A/> > <B/> > </Test> > > In this example there is an intervening B, so the rule is not satisfied: > > <Test> > <B/> > <A/> > <A/> > <B/> > <A/> > <B/> > </Test> > > Below is the XPath that I created. I have two questions about it: > > (1) Is it correct? Do you see anything it would fail to catch? > > (2) Is there a better (simpler, more efficient) XPath expression? > > Here is the XPath (within a Schematron rule): > > <sch:rule context="Test"> > <sch:assert test=" > every $i in A satisfies > (if ($i/preceding-sibling::A) then $i/preceding-sibling::*[1][self::A] else true()) > and > (if ($i/following-sibling::A) then $i/following-sibling::*[1][self::A] else true()) > "> > All A's shall be contiguous within Test. > </sch:assert> > </sch:rule> > -- 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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