Subject: Re: [xsl] Sequences in XSLT 2.0.. From: Midsummer Sun <midsummer.sun@xxxxxxxxx> Date: Mon, 14 Mar 2005 23:11:45 +0530 |
Thank you David for a nice explanation. Best regards, When in doubt, use brute force. -- Ken Thompson On Mon, 14 Mar 2005 17:18:45 GMT, David Carlisle <davidc@xxxxxxxxx> wrote: > > > Now everything is a sequence. > > Earlier everything was a node-set. > > not quite true. In XSLT2 everything is a sequence but in xslt1 atomic > values such as numbers and strings were not in a node set or a sequence. > > One advantage of sequences is that you can store sequences of strings > etc ("a","b", ....) > > The other is that sequences become first class objects that may be saved > in variables and re-used. XSLT1 had sequences (called lists there) > but these were just transient objects "the current node list" > that could not be stored. > > If you go select="ancestor::*[2]" then just inside the step the current > node list is the ancestors in reverse document order so [2] selects your > grandparent, but this could not be stored, > ,xsl:variable name="x" select="ancestor::*"/> > selects the unordered set of ancestors then > select="$x[2]" > orders that set in document order so [2] selects teh grandchild of the > document element. > > Similarly inside > <xsl:for-each select="zzzz"> > <xsl:sort select="mmm"/> > > the current node list is the ordered list sorted by mmm but that list > can not be saved in order, if you need it again later you have to > re-sort. In XSLT2 sorted sequences can be saved. > > Other reasons have to do with alignment with xsd schema but they are, > natutrally:-) almost all bad, but on balance ordered sequences are > probably a good thing (although perhaps they might have been better > still if they had allowed sequences of sequences) > > David > > ________________________________________________________________________ > This e-mail has been scanned for all viruses by Star. The > service is powered by MessageLabs. For more information on a proactive > anti-virus service working around the clock, around the globe, visit: > http://www.star.net.uk > ________________________________________________________________________
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