[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XPath for expressing contiguous elements?
Here is one without any negation: /*/A[preceding-sibling::A][following-sibling::A] [preceding-sibling::*[1][self::A]] [following-sibling::*[1][self::A]] and true() On Mon, May 1, 2017 at 7:21 AM, Michael Kay mike@xxxxxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > not(*[not(self::A)][following-sibling::A][preceding-sibling::A]) > > returns true if and only if there is no non-A element that is both preceded and followed by an A element, which I think is equivalent to your expression and rather simpler. > > Michael Kay > Saxonica > > >> On 1 May 2017, at 14:00, 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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