[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XPath for expressing contiguous elements?
> And here is an XPath 2.0 expression: > > empty(/*/B[. >> /*/A[1] and /*/A[last()] >> .]) Making this more general: empty(/*/*[not(self::A)][. >> /*/A[1] and /*/A[last()] >> .]) This XPath expression happens to be slightly shorter (by 3 characters) than the XPath 1.0 expression suggested by Dr. Michael Kay: not(*[not(self::A)][following-sibling::A][preceding-sibling::A]) Cheers, Dimitre On Mon, May 1, 2017 at 11:42 AM, Dimitre Novatchev <dnovatchev@xxxxxxxxx> wrote: > 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. -- 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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