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   Re: [xml-dev] XPath variables - immutable or not?

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At least in Jaxen, we view variables as, well, variable. 

Users use them to create sort of 'prepared-statements' that can
be parameterized upon evaluation.

We allow a user to swap out the VariableContext (the name->value
lookup index) between evaluations.  But, we might be taking a
liberal view, because we also allow users to swap out the
FunctionContext and NamespaceContext at will.


On Wed, 13 Nov 2002 AndrewWatt2000@aol.com wrote:

> I love the way that W3C specifications can sometimes throw up disconnected 
> questions.
> In the XForms 1.0 CR the phrase, "XPath variables that change in value from 
> one recalculate to the next ..." started me thinking about just what I think 
> I know about "XPath variables".
> Tacitly, I think I had assumed that "XPath variables" are immutable, possibly 
> because  I typically meet variables in connection with XPath expressions in 
> the context of XSLT 1.0.
> A quick look through XPath 1.0 REC and XPath 2.0 WD revealed remarkably 
> little information about "XPath variables". I certainly couldn't find 
> anything to confirm my earlier tacit assumption that they are immutable.
> In fact, I am even beginning to wonder if XPath variables actually exist. 
> .... Not, of course, that that is a question of life or death! :)
> Andrew Watt
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Bob McWhirter        bob@werken.com
The Werken Company   http://werken.com/


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