Hi Jeroen,

Jeroen Janssen wrote:
> 
> A related question; is there any way of seeing what the result of an
> expression is? I know I'm doing something wrong but "Reference to variable
> or parameter 'path' must evaluate to a node list" is a bit vague, I would
> like to see what's actually happening...
> 

I find xsl:message and xsl:comment really useful for tracking
intermediate results. xsl:comment is more portable because msxsl (unlike
saxon) will ignore any xsl:message that does not have terminate="true".
They're both a bit verbose because you need to have an xsl:value-of (or
two) to get your expression's result into the message or variable, but
it's not complicated.
 
These two debugging techniques are surprisingly seldom mentioned, but I
find them really useful.

Francis.

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