Re: [xsl] Locating an attribute and its value indirectly

Subject: Re: [xsl] Locating an attribute and its value indirectly
From: "G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 07 Nov 2011 13:12:21 -0500
At 2011-11-07 12:57 -0500, Wendell Piez wrote:

On 11/7/2011 12:32 PM, Michael Kay wrote:
On 11/4/2011 9:27 PM, G. Ken Holman wrote:
The current() function returns that node that was current at the
beginning of the evaluation of the XPath expression.

I'm sure Ken won't mind if I add a little color commentary. It may help to keep in mind that the "context node" is an XPath concept, while the "current node" is an XSLT concept.

That's the way the 1.0 specifications described it. In 2.0 both specs speak of the context item, and the current() function, rather inelegantly, is defined as returning "the item that was the context item at the point where the [XPath] expression was invoked from the XSLT stylesheet. "

I suppose that's understandable, inasmuch as XSLT 2.0 in general is being pulled in the direction of a generalized data processing language and not just a tree transformation language. (What with xsl:for-each no longer selecting -- or, some day, template rules no longer matching -- only nodes.)

Yet I dare say it may help to keep a rough distinction in mind in any case.

So does this also mean the concepts of "current node list" etc. go by the boards? (Now going to look and see.)

Yes, it does ... it is now the "context list".

J.2.1 Pervasive changes

    The description of the evaluation context has been
    changed. The concepts of current node and current
    node list have been replaced by the XPath concepts
    of context item, context position, and context size.

Though I don't often remember to use that terminology since the list sometimes has to be nodes. For example in XSLT 1 and 2 some constructs (like the "/" operator) require the context list returned by left hand side to be a node list ... but I understand this is likely to be changed in the next version.

And I don't mind at all that you point out nuances in my posts, Wendell ... we are all participating to help posters and enrich the archive.

. . . . . . . . . . Ken

-- Contact us for world-wide XML consulting and instructor-led training Free 5-hour video lecture: XSLT/XPath 1.0 & 2.0 Crane Softwrights Ltd. G. Ken Holman mailto:gkholman@xxxxxxxxxxxxxxxxxxxx Google+ profile: Legal business disclaimers:

Current Thread