How can I declare node sets explicitly?

Kay Michael wrote:

> The select attribute of xsl:apply-templates must be a node-set, not a string.
> 
I would like to specify a node set explicity and declare it in a
variable. For the moment, I am doing something like,

<xsl:apply-templates="(field1)|(field2)|(field3)"/>

but in order to provide easier extensibility, I would like to declare
this elsewhere. However, as you pointed out,

<xsl:variable name="local_field">
    (field1)|(field2)|field3)
</xsl:variable>

won't work because then $local_field is a string and not a node set.
 
Do you have any suggestion for me?

Thanks for your help and best regards,
Matthias

--
Matthias O. Will (m.o.will@xxxxxx)                       <>< 
Institute of Computer Science,       University of Freiburg
Georges-Koehler-Allee, Bldg. 51, D-79110 Freiburg,  Germany	 
Phone:   +49-761-203-8170             Fax: +49-761-203-8162  
URL:     http://ad.informatik.uni-freiburg.de/~will


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