Re: [xsl] A really easy (hopefully) question

Subject: Re: [xsl] A really easy (hopefully) question
From: Uche Ogbuji <uche.ogbuji@xxxxxxxxxxxxxxx>
Date: Fri, 09 Feb 2001 07:27:01 -0700
> > The "current node" and "current node list" are XSLT concepts,
> > not XPath
> > concepts. What would you expect current() to return in
> > another non-XSLT implementation of XPath?
> It would be quite easy to define it as "the node that is the context node
> for the XPath expression as a whole, outside any predicates". I assume
> no-one thought that would be useful enough to justify it.

4XPath doesn't, but I do agree that it makes some sense.  We'd probably 
require current() to be qualified with the XSLT namespace if used in 
free-standing 4XPath.

> It would be interesting to know whether free-standing XPath implementations
> actually provide this function or not. As far as I can see neither
> Microsoft's nor Xalan's free-standing XPath processors give you any
> (documented) way of defining variables, which ARE part of the XPath spec.

In 4XPath this looks like

from xml.xpath.Context import Context
from xml.xpath import Evaluate
vars = {('', 'sillyvar'): 'hello world'}
nss = {'pref': ''}
con = Context(dom_node, varBindings=vars, processorNss=nss)
result = Evaluate('$pref:sillyvar', context=con)

Quick n dirty Python primer for the above

{a: b, c: d} is a dictionary or associative array with a & c as the keys and b 
& d as the values.
(a, b, c) is a tuple of values, similar to a list

Uche Ogbuji                               Principal Consultant
uche.ogbuji@xxxxxxxxxxxxxxx               +1 303 583 9900 x 101
Fourthought, Inc.                
4735 East Walnut St, Ste. C, Boulder, CO 80301-2537, USA
Software-engineering, knowledge-management, XML, CORBA, Linux, Python

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