Re: [xsl] Fwd: xsl:key() and $variables.

[Michael B Allen <mba2000@xxxxxxxxxx>]

On Fri, 21 Jul 2006 18:42:29 -0400
Steve <subsume@xxxxxxxxx> wrote:

> ---------- Forwarded message ----------
> From: Steve <subsume@xxxxxxxxx>
> Date: Jul 20, 2006 3:41 PM
> Subject: xsl:key() and $variables.
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> 
> 
> I have a variable containing
> 
> <Records>
>    <Record>
>       <activity>Baseball</
>       <hours>36</
>    <Record>
>       <activity>Shopping</
>       <hours>39</
>    <Record>
>       <activity>Writing</
>       <hours>3</
>     ......etc  (yes, I know they're not closed.)
> 
> and some xml (document('../blah.xml') containing...
> 
> <activities>
>     <activity neccesary="no">Baseball</
>     <activity neccesary="no">Shopping</
>     <activity neccesary="yes">Writing</
> 
> ..............
> 
> How do I  <xsl:apply-templates select="$variable/Records/Record[1]" />
> only those records which are neccesary="yes"  ?

First, I don't think XSLT was designed to do SQL style joins. It's not
a database API.

But. That doesn't mean you can't do it.

You could do a call-template() that does for-each on
activities/activity[@necessary='yes'] and return the Record that has an
activity/text() equal to the desired activity.

> I swear one of these posts I'll have xsl:key figured out.

I've never heard of xsl:key but the second illustration here:

 http://www.cranesoftwrights.com/resources/xslkeys/index.htm

looks useful. It seems an xsl:key is like a variable containing
a list of elements that match the xpath expression. But the key()
function allows you to filter on that list further by providing a key
(overloaded term warning). So in the above illustration the xsl:key
statement builds a list of Employee elements and indicates that the SSN
child should be used when a key is supplied to the key() function. So
the key('people',@emp) call says, "fetch all elements in the 'people'
list using the SSN @emp. Presumably each Employee would have a unique
SSN and therefore the key() call will return one Element.

Mike

-- 
Michael B Allen
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http://www.ioplex.com/