> >> Can anyone please tell me how to test whether a variable has been
> defined?
> >
> >There is no such test. ...
>
> What if the variable may, or may not, be defined as a global
> variable in a
> stylesheet which imports or includes the stylesheet you are writing?

It's always known at compile time which variables are in scope, because
xsl:import and xsl:include can be resolved at compile time. Therefore,
there's no point in having a run-time test on the existence of a variable,
any more than there is in C or Java.

Mike Kay


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