If you want to construct XPath expressions on the fly as strings, you
will need the xx:evaluate() extension which several products (Saxon,
Xalan, ...) offer.

Michael Kay

> -----Original Message-----
> From: owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx 
> [mailto:owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Ruth Ablett
> Sent: 08 February 2004 07:53
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Literals in XSLT
> 
> 
> Hello,
> 
> I am attempting to write an XML-to-XML filter for document 
> entries. The user 
> can filter the XML file by author, title, or type (ps, pdf, 
> doc, etc). 
> Structure of xml:
> 
> <?xml version="1.0">
> <repository>
>   <so>
>     <author>Bob</author>
>     <title>I Like Cheese</title>
>     <type>pdf</type>
>   </so>
> </repository>
> 
> To do it all in one XSL file, I wrote the following:
> 
> <xsl:param name="query">'Ruth Ablett'</xsl:param>
> <xsl:param name="search-mode">=</xsl:param>
> <xsl:param name="sort-by">author</xsl:param>
> <xsl:param name="BigQuery" select="concat($sort-by, 
> $search-mode, $query)"/>
> 
> ... XSL required stuff...
> 
> <xsl:template="/">
>   <xsl:if test="{$BigQuery}">
>     <xsl:apply-templates select="so">
> 
> ... the "so" template has the required stuff to filter the document. 
> However, the transformer blows up at {$BigQuery}. Can I use 
> literals {} like 
> that?
> 
> Thanks.
> Ruth
> 
> --------
> Ruth Ablett
> utaku_rutsuko@xxxxxxxxxxx
> http://www.geocities.com/tokyo/4390
> 
> "Microsoft's No. 1 product is Windows, which now comes automatically 
> installed on every computer in the world and many kitchen appliances. 
> Technically, Windows is an "operating system," which means 
> that it supplies 
> your computer with the basic commands that it needs to 
> suddenly, with no 
> warning whatsoever, stop operating.
> 
> I speak from experience here. Many a time I have spent hours 
> writing a 
> serious and thoughtful column on an important issue, only to 
> have Windows -- 
> which is often referred to as "the French labor union of 
> software" -- get 
> into a snit and call a general computer strike that erases 
> all my work 
> moments before deadline, leaving me with no choice but to 
> bang out a highly 
> inaccurate column such as this one."
> 
> - Dave Barry
> 
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