[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Is Anyone Interested In XPath 2.0 Use Cases or Requiremen
At 02:08 8/7/02, David Carlisle wrote: >Yes of course. If you want value based set equality that's > not($b[. != $a]) and not($a[. != $b]) Um... (thinks, scribbles in *scratch*, checks spec) ITYM not($b[not(. = $a)]) and not($a[not(. = $b)]) No? $b[. = $a] returns all X in $b such that there is some Y in $a for which X = Y $b[. != $a] returns all X in $b such that there is some Y in $a for which X != Y $b[not(. = $a)] returns all X in $b such that there is no node Y in $a for which X = Y In other words, if the three nodes in $b have values "1", "2", and "3", as do the three nodes in $a: $b[. = $a] will return 3 nodes, because for each node X in $b, there is a node Y in $a with the same value. But $b[. != $a] will *also* return 3 nodes, because for each node X in $b, there is a node Y in $a with a *different* value. (I know David knows this, but I wanted to convince myself... see the note in §3.4 of XPath 1.0 if curious for details. David's solution will work if $a and $b each have only one node.) ~Chris -- Christopher R. Maden, Principal Consultant, crism consulting DTDs/schemas - conversion - ebooks - publishing - Web - B2B - training <URL: http://crism.maden.org/consulting/ > PGP Fingerprint: BBA6 4085 DED0 E176 D6D4 5DFC AC52 F825 AFEC 58DA
|
PURCHASE STYLUS STUDIO ONLINE TODAY!Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced! Download The World's Best XML IDE!Accelerate XML development with our award-winning XML IDE - Download a free trial today! Subscribe in XML format
|