Re: [xsl] element value based on attribute selection

[Jeni Tennison <mail@xxxxxxxxxxxxxxxx>]

Hi Dave,

> I want to select the value of the <parameter
> name="UserDN">wjohnson</parameter> out of all the
> <parameter> tags.
>
> <xsl:apply-templates select="//parameter???"/>

What is it about that parameter that you want to select on -
presumably its name attribute?  You can get the value of the name
attribute with:

  @name

Test whether it's the same as 'UserDN' with:

  @name = 'UserDN'

and if you put that in a predicate (square brackets) it'll filter the
list of parameter elements accordingly:

  //parameter[@name = 'UserDN']

You might find it better to step down to the parameter elements rather
than use // - otherwise the processor will hunt for parameter elements
all through the document when it doesn't really need to.  Use:

  /parameters/parameter[@name = 'UserDN']

If you have *lots* of parameter elements, and you're picking them out
by their name lots of times, you might find it helpful to define a
key so you can index into them:

<xsl:key name="parameters" match="parameter" use="@name" />

Then you can use:

  key('parameters', 'UserDN')

instead.

[If you wanted to get it by position, use:

  /parameters/parameter[1]

 as it's the first parameter in the list.]

I hope that helps,

Jeni

---
Jeni Tennison
http://www.jenitennison.com/



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