RE: [xsl] xsl:key and document()

Subject: RE: [xsl] xsl:key and document()
From: Robert Goheen <RobertG@xxxxxxxxxxx>
Date: Mon, 8 Jan 2001 09:08:10 -0800
Thanks for the great response.  It works great!  I would never have thought
placing a new document context in a xsl:for-each block....

Here's a side question as a result of the answer.  If I didn't want to use a
variable in the key, how could I refer back to the document I'm currently
parsing when I'm in the context of the external doc?  Specifically, what if
I wanted to do something like:

   <xsl:for-each select="document('LUType.xml')">
      <xsl:value-of select="key('LUType', ParentDocReference/Tag/@ID)" />

Even more specifically, if I'm either in a loop or template processing a
specific tag within my first document, how to I refer to the current() node?


> -----Original Message-----
> From: Jeni Tennison [mailto:mail@xxxxxxxxxxxxxxxx]
> Sent: Saturday, January 06, 2001 3:29 AM
> To: Robert Goheen
> Cc: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [xsl] xsl:key and document()
> Hi Robert,
> > I'm trying to build a XSL doc that uses a couple of keys (using
> > MSXML 3.0). The values I want for these keys, however, are located
> > in XML documents other than the main document. However, I haven't
> > been able to use xsl:key to reference external documents.
> Yes, annoying isn't it? ;) The thing you have to realise is that the
> key definition uses a *match pattern*, not a *select expression*, to
> identify the nodes that it indexes. When key() is called, it looks for
> nodes that match the match pattern for the key *in the document
> holding the current node*, and indexes them.
> So, to create a key that will match nodes in your separate document,
> you need an xsl:key element that matches those nodes and don't need to
> worry about pointing out they're in a different document at all:
> <xsl:key name="LUType" match="record" use="@ID" />
> It's when you *use* the key that you determine which document is
> searched.  You need to change the current node to be in the document
> you want to search in; usually you'd do this with an xsl:for-each:
>   <xsl:for-each select="document('LUType.xml')">
>      <xsl:value-of select="key('LUType', $keyValue)" />
>   </xsl:for-each>
> Remember that within the xsl:for-each, the current node is the
> document root node, and therefore if you use an expression in the key
> value then it will be resolved relative to that document's root node:
> usually you'll want to use a variable.  Remember also that it's an
> xsl:for-each, but actually you're just using it to change the current
> node - don't have a select expression that contains more than one node
> or it will repeat output left, right and centre.
> There are occasions where this limitation on key() causes real
> problems, particularly when you're using key() within a sort select
> expression, but usually the above method fits in with what you're
> trying to achieve.  Let us know if not.
> I hope that helps,
> Jeni
> ---
> Jeni Tennison

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