[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Duality of quantifiers
A decent optimizer will convert count(XXX)=0 to empty(XXX), but you run the risk that without a decent optimizer, the processor will carefully count how many items satisfy the predicate rather than returning a result as soon as it finds the first. Michael Kay Saxonica > On 10 Jul 2018, at 23:06, Peter Flynn <peter@silmaril.ie> wrote: > > On 10/07/18 22:42, Costello, Roger L. wrote: >> Hi Folks, >> >> So, you’ve got an XML document containing a bunch of integers: >> >> <Test> >> <x>2</x> >> <x>4</x> >> <x>5</x> >> <x>7</x> >> <x>10</x> >> … >> </Test> >> >> You want to know: Is it true that not all the integers are even? > > I'd test if count(Test/x[. mod 2 gt 0])=0 > > But I don't know if there is a penalty in processing that compared with > the more complex solutions. > > ///Peter > -- > Peter Flynn | Principal Consultant | Silmaril Consultants | Cork 🇮🇪 > Ireland | ☎ +353 86 824 5333 | ✉ peter@silmaril.ie | 🌍 > blogs.silmaril.ie/peter > > _______________________________________________________________________ > > XML-DEV is a publicly archived, unmoderated list hosted by OASIS > to support XML implementation and development. To minimize > spam in the archives, you must subscribe before posting. > > [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ > Or unsubscribe: xml-dev-unsubscribe@lists.xml.org > subscribe: xml-dev-subscribe@lists.xml.org > List archive: http://lists.xml.org/archives/xml-dev/ > List Guidelines: http://www.oasis-open.org/maillists/guidelines.php
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