Subject: Re: [xsl] XPath for expressing contiguous elements? From: "Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Mon, 1 May 2017 15:27:19 -0000 |
Sorry, this works only on Roger's examples ... > 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 8:06 AM, Dimitre Novatchev <dnovatchev@xxxxxxxxx> wrote: > 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. -- 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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