Re: [xsl] using a parameter to modify part of the file path in document(...) function

[Abel Braaksma <abel.online@xxxxxxxxx>]

Tracey Zellmann wrote:
> I was able to resolve this.
>
> I needed to include in my stylesheet
> <xsl:param name="buidlingDataFile"/>
>
> Not exactly sure why I need this in this case, but not in others.
It should be that way in all cases (well: you can use either 
xsl:variable or xsl:param), you did the right thing.

When you want to use an external parameter (one given to the xslt 
stylesheet by the processor, from the commandline or a program), the 
parameter must have been declared inside the xslt, at root level, with 
<xsl:param>, before you can use it. Afaik, this is also true for ATV 
(attribute value templates, the format you where referring to earlier, 
with the curly braces). Using a variable or a parameter which was not 
declared, is an error.

In XPath 1.0 it is defined so: "A VariableReference evaluates to the 
value to which the variable name is bound in the set of variable 
bindings in the context. It is an error if the variable name is not 
bound to any value in the set of variable bindings in the expression 
context." (see: http://www.w3.org/TR/xpath#section-Basics),

In understandable English I think this means: if the variable reference 
(the thing after the dollar sign) is not there in your document, in an 
imported document, or not in the scope of the current statement, an 
error will rise.

If your processor does not treat it as an error when you reference a 
parameter or variable that is not declared, I think your processor has a 
bug.

Cheers,

Abel Braaksma
http://abelleba.metacarpus.com