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RE: [xsl] select in the tag

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> Am I right in saying that declaring the <xsl:param /> tag as 
> follows will make the named node set default to null if the 
> template is called without the <xsl:with-param /> tag.
> 
> <xsl:param name="node-set" select=".." />
> 
> or is it
> 
> <xsl:param name="node-set" select="" />
> 

Both wrong. select=".." causes the default to be the parent of the
context node. It's highly unusual to use a default value for a param
that depends on the context, and I can't think of any good reasons for
wanting to do it, but it is permitted.

The second is an error. The value of the select attribute has to be an
expression.

A common convention for getting an empty node-set in XPath 1.0 is /..
(which selects the parent of the root, which doesn't exist). In XPath
2.0 you write "()".

Michael Kay


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