Subject: Re: [xsl] intersection puzzle From: David Carlisle <davidc@xxxxxxxxx> Date: Wed, 6 Apr 2005 10:50:19 +0100 |
Your post is unclear as to whetjer you are trying to find teh intersection based on node identity ie find thoe nodes that are in both node sets or to find those nodes in one node set have the same value for some definition of value) as some other node in a different node set. <xsl:variable name = "intersection" select ="$polo[count(. | $marco) = count($marco )] " /> This is successful, but I don't see a good way to manipulate the individual attributes (again, to add 1 to a value to find nodes with neighboring values). This is based on node identity, so you are testing if the _same_ node appears in each set, not just whether nodes with the same values appear. <xsl:variable name = "intersection" select = "$polo/square[ @h =$marco/square/@h and @v = $marco/square/@v ] " /> This is a completely different beast it is comparing values: you want to count two nodes as the same if they have the same h and v attributes. It doesn't work as you are selecting different $marco/square elements within the predicate. I don't think you can do this test with a single XPath1 expression. <xsl:variable name = "intersection" select = "$polo/square[@h = $marco/square/@h + 1 and @v = $marco/square/@v ] " /> that code doesn't behave anything like the example it is based on. @h = $marco/square/@h is a test of node-set = node set so is true if any node in the first set has teh same string value as any node in the second. @h = $marco/square/@h +1 is a test of node-set = number so is true if the string value of the first (only in this case) node in @h, after being coerced to a number is equal to the number. the number in question is the numerical value of $marco/square/@h +1 which is obtained by adding 1 to the numerical value of $marco/square/@h whenever a node-set is used in a numeric or string context the string value of the first node in document order is used, and the other nodes are discarded. 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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