Re: Binding a variable within a "value-of select"

> I was thinking to use the { } as a solution.

{} is never Xpath syntax, so

<xsl:value-of select="WBSLServiceData/{$addorDef}/PostCode"/>
<xsl:value-of select="{WBSLServiceData/$addorDef/PostCode}"/>


are both syntax errors

<xsl:value-of select="WBSLServiceData/$addorDef/PostCode"/>

is legal syntax and if $addorDef contained a node set this would
evaluate to some value, but you say that it
contains a ___string___ so the above is equivalent to


<xsl:value-of select="WBSLServiceData/'def'/PostCode"/>

which is a type error you can't use a string in the middle of an Xpath.

variables hold values, not fragments of Xpath syntax. If you have a
variable foo in C (or Java or pretty much any other language you choose)
that contained a string such as " + 1" you wouldn't expect to be able to
use 
 2 foo
to expand to
2 + 1 
and so evaluate to 3.

variables in XSL are (a bit) like variables in C they are not like C
preprocessor macros.

If you have a variable that contains Xpath syntax then you need an
extension function that makes an Xpath parser available at run time.
(eg saxon:evaluate) or if the variable is just a single element name the
FFFFAQ answer is
WBSLServiceData/*[name()=$addorDef]/PostCode

David

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