Andy Fish <ajfish@b...> wrote in
<Vqb9i.31422$Ro3.15173@t...>:
> "David Carlisle" <david-news@d...> wrote
> in message news:46608917.2000608@d......
>> Andy Fish wrote:
>>> so $param1 has no value (empty string? empty node set?
>>> I'm not sure)
>>
>> rather than have it default to an empty string, and then
>> having to test for that to avoid using the variable in
>> path expressions, it's usually simpler just to make it
>> default to an empty node set, add <xsl:param
>> name="param1" select="/.."/>
>
> unfortunately there were quite a lot of templates with
> this optional parameter, although only one of them
> actually used the parameter.

[...]
 
> so as well as some way of telling whether a variable
> contains a node set, string or RTF, I would also like to
> have an option on <xsl:call-template> and <xsl:apply
> template> that said:
> 
> if this parameter was passed in to me, pass the parameter
> into the next template,. otherwise don't pass in the
> parameter into the next template

Read XSLT2 spec, 10.1.2 and rejoice. (Although I must say I
don't see how precisely that would help you, since from the
description of your predicament it would seem you'd have to
specify the tunneling everywhere anyway.)

-- 
Pavel Lepin