Re: [xsl] Key lookup without context.

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 2008-12-19 14:21 +0100, peter verhaar wrote:
> I have a 'context-free' function which does a key() lookup. However,
> saxon is complaining:
>
> SXWN9009: Cannot select a node here: the context item is undefined
>
> Question: How can I say: "Start a key lookup from the root of the file"?

By using the third argument of key():  it is defined as the apex of a 
tree under which which the keyed values are searched.

> I tried select="\\key('myKey'...."  but this didn't work.
>
> So I have:
>
> <xsl:key name="myKey" match="books/book/...." use="..."/>

Add a variable with global scope:

<xsl:variable name="myBooks" match="/"/>

> <xsl:function name="...." as="xs:double">
>  <xsl:param name="input"/>
>     <xsl:for-each select="key('myKey',$input)">

key('myKey',$input,$myBooks)

>         processing goes here
>     </xsl:for-each>
> </xsl:function>

I hope this helps.

. . . . . . . . . . . . Ken


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