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Re: Fwd: [xsl] curly braces


Subject: Re: Fwd: [xsl] curly braces
From: Ihe Onwuka <ihe.onwuka@xxxxxxxxxxxxxx>
Date: Thu, 20 Sep 2012 00:57:08 +0100

On Thu, Sep 20, 2012 at 12:11 AM, Michael Kay <mike@xxxxxxxxxxxx> wrote:
> Ihe,
>
> Your stylesheet contains the element
>
>
> <this:fieldName elem="productThumbnail" plural="thumbnails"
> bracketType="{{"/>
>
> as part of the definition of a global variable. If this is executed as a
> literal result element the result will be the element
>
>
> <this:fieldName elem="productThumbnail" plural="thumbnails"
> bracketType="{"/>
>
> (with a single "{").
>
> But you are not executing it as a literal result element, you are reading it
> from the source XML of the stylesheet using the function call doc(''). In
> elements read from source documents, curly braces have no special
> significance, so "{{" represents itself. If the element were in a normal
> source document, then bracketType="{" would work fine, but because the
> element has a dual role (as an element in a source document and as a literal
> result element in a stylesheet), bracketType="{" is an error.
>
> The idea of reading the source document using document('') is a hack used in
> XSLT 1.0 to get around the restrictions on using result tree fragments. It
> is never needed in XSLT 2.0: use the global variable directly. (It's also a
> very inefficient hack, because the stylesheet has to be parsed twice.)
>

I resorted to that hack because if I have this

    <xsl:variable name="this" as="node()">
       <this:desiredFields>
         <product/><m__id/>...........<productThumbnail/>
       </this:desiredFields>
    </xsl:variable>

and then try to use the variable $this as the third parameter in a
call to the key function I get

net.sf.saxon.trans.XPathException: In the key() function, the node
supplied in the third argument (or the context node if absent) must be
in a tree whose root is a document node


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