Re: Hello and quick question

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Subject: Re: Hello and quick question
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Tue, 07 Jan 2003 14:01:05 -0500

What's worse, the expression:

/ROOT/Client/Contacts/Contact[isReferrer='0'][1]/ContactFirstName

will give results that are counterintuitive, since the [1] predicate operates not on the expression as a whole, but only on that particular step of that expression,

"Contact[isReferrer='0'][1]"

which (as all XSLT users certainly know!) is short for

child::Contact[isReferrer='0'][position()=1]

which means you'll get, not the first such Contact node in the document, but every Contact node (that meets the isReferrer criterion) *that is the first such child of its parent*.

To get around this, you can say

(/ROOT/Client/Contacts/Contact[isReferrer='0'])[1]/ContactFirstName

(Grouping the entire expression indicates the predicate [1] applies to the expression as a whole.)

But I actually rather like Corey's solution

string(/ROOT/Client/Contacts/Contact[isReferrer='0']/ContactFirstName)

...although were I to use it in a stylesheet, I'd certainly explain it in a comment -- as something non-obvious that might be expected to break if, say, the rules of how node-sets are converted into strings should change....

Cheers,
Wendell

At 11:36 PM 1/6/2003, Joerg's wrote:

Maybe you can better use some possible optimizations of the proceesor by adding [1] into the expression:

/ROOT/Client/Contacts/Contact[isReferrer='0'][1]/ContactFirstName

Furthermore you sometimes need a node set (even it's a single node) and not a string, e.g. <xsl:apply-templates select="/ROOT/Client/Contacts/Contact[isReferrer='0'][1]/ContactFirstName"/>, that won't work with string().

Simon has a little error in his expression. He selects the first Contact element, independent of [isReferrer='0'] or not. If this first Contact element does not have a child 'isReferrer' with text value '0', his node set would be empty.

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Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
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Current Thread
Hello and quick question Corey Snow - Mon, 6 Jan 2003 18:53:21 -0500 (EST) S Woodside - Mon, 6 Jan 2003 19:15:00 -0500 (EST) <Possible follow-ups> Corey Snow - Mon, 6 Jan 2003 18:57:52 -0500 (EST) Joerg Heinicke - Mon, 6 Jan 2003 23:35:16 -0500 (EST) Wendell Piez - Tue, 7 Jan 2003 14:08:06 -0500 (EST) <=

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