Subject: [xsl] thanks! now help on alternating rows needed. From: "Bill Carter" <bcarter2003@xxxxxxxxxxx> Date: Sat, 07 Sep 2002 14:54:03 -0500 |
<stocks> <ticker>AAA</ticker> <ticker>ABT</ticker> <ticker>BIG</ticker> <ticker>CBS</ticker> <ticker>CBS</ticker> <ticker>IBM</ticker> <ticker>XYZ</ticker> </stocks>
gives me: AAA: Pos:1 ABT: Pos:2 YELLOW BACKGROUND BIG: Pos:3 CBS: Pos:4 YELLOW BACKGROUND CBS: Pos:5 IBM: Pos:6 YELLOW BACKGROUND XYZ: Pos:7
AAA: Pos:1 ABT: Pos:2 YELLOW BACKGROUND BIG: Pos:3 CBS: Pos:4 YELLOW BACKGROUND IBM: Pos:6 YELLOW BACKGROUND XYZ: Pos:7
From: Mike Brown <mike@xxxxxxxx> Reply-To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx Subject: Re: [xsl] preceding...please help understanding... Date: Sat, 7 Sep 2002 12:13:10 -0600 (MDT)
Bill Carter wrote: > I am having trouble understanding preceding.
What you don't realize about preceding is not affecting your results. The preceding axis picks up more nodes than preceding-sibling. You probably want preceding-sibling. Otherwise, if you have something like
<foo> <stocks> <ticker>ZZZ</ticker> <ticker>AAA</sticker> </stocks> <stocks> <ticker>AAA</sticker> <ticker>BBB</sticker> </stocks> </foo>
and you start at the BBB ticker, preceding::ticker picks up the first ZZZ and AAA as well as the immediately preceding AAA. preceding-sibling::ticker will get you just the ones you want.
What you're confused about, though, and this is what is skewing your results,
is equality comparisons on node-sets.
$set1 = $set2 is true if any node in $set1 has a string-value equal to the string-value of any node in $set2.
$set1 != $set2 is true if any node in $set1 has a string-value not equal to the string-value of any node in $set2. != is very rarely what you want. Use not() and = instead, like this:
not($set1 = $set2)
...which will be true if no node in $set1 has a string-value equal to the string-value of any node in $set2.
Similar rules apply if instead of $set1 you have any other object type;
if the operand on the right is a node-set, then the string-value of the left
operand is compared to the string-value of every node in the node-set.
- Mike ____________________________________________________________________________ mike j. brown | xml/xslt: http://skew.org/xml/ denver/boulder, colorado, usa | resume: http://skew.org/~mike/resume/
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