Re: [xsl] Using key with XPath and use value?

[Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>]

Steven,

You can enhance your key by including in its value some kind of identifier 
of the b element, to disambiguate d elements not only by their @pub, but by 
their b ancestors, as in:

<xsl:key name="pubsBySubheadandB" match="d"
   use="concat(generate-id(ancestor::b), '-', @pub)"/>

With this trick, you want to be careful, since the expression in @use now 
returns a string not a node-set. But since you never have more than one 
@pub per b element (attributes being what they are), you're okay here.

Naturally when you call the key you need to perform the same concatenation.

Cheers,
Wendell

At 12:14 PM 1/15/2003, you wrote:
> If <xsl:key> is defined at the top-level of a document (i.e., globally), can
> you get to values based on the XPath as well as the key value?
>
> For example, I'm attempting to output subheads based on the attribute value
> of an element. I have element <b> which can have several element <d>
> descendants. <d> has a 'pub' attribute which is used to determine the
> subhead I need and all matching pub attributes are grouped for output under
> the appropriate subhead. <b>, however, can occur any number of times in a
> document. If I define a key as such:
>
> <xsl:key name="pubsBySubhead" match="d" use="@pub"/>
>
> can I get to the values for only the specific <b> for which I'm processing?
> I seem to be getting everything indexed in the key for each matching @pub,
> which is basically all the matches thoughout the whole document.


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Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
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