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Re: node-selection

Subject: Re: node-selection
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Fri, 29 Oct 2004 16:53:56 -0400
Re:  node-selection
At 03:44 PM 10/29/2004, you wrote:
Wendell Piez wrote:

(//item[@active=1])[last()]
Or
/descendant::item[@active=1][last()]

I was thinking of:


/descendant-or-self::item[@active=1][last()]

This works too, though it is redundant, there being no chance that the root node of the document is itself an 'item' element node. (/self::item, or /self::* for that matter, must return empty node sets.)


Note that they all function differently, though give the same result in most cases. I love these kind of subtle differences!

Yes: understanding these shows you the seams and joins in XPath, revealing how it is put together.


Cheers,
Wendell


====================================================================== Wendell Piez mailto:wapiez@xxxxxxxxxxxxxxxx Mulberry Technologies, Inc. http://www.mulberrytech.com 17 West Jefferson Street Direct Phone: 301/315-9635 Suite 207 Phone: 301/315-9631 Rockville, MD 20850 Fax: 301/315-8285 ---------------------------------------------------------------------- Mulberry Technologies: A Consultancy Specializing in SGML and XML ======================================================================

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