Re: Be careful writing XPath expressions when the XML couldhav

From: John Cowan <johnwcowan@gmail.com>
To: Wendell Piez <wapiez@wendellpiez.com>
Date: Wed, 30 Jul 2014 12:39:03 -0400

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On Wed, Jul 30, 2014 at 10:49 AM, Wendell Piez <wapiez@wendellpiez.com> wrote:

But in the general case, I want select //div[@class='section'] to
return every div that has a 'class' attribute whose value is
'section', and none whose @class is something else, or not there at
all. So "@class='section'" returns false() when @class returns an
empty sequence (or node set in XPath 1.0.)

What do you want it to return: a run-time error?

Clearly not. But what I could see would be an XSLT feature to make it an error

to match against a path that matches nothing. There would need to be a way

to turn this on and off selectively, of course.

Separation of concerns suggests a Schematron schema would do better, though.

--
GMail doesn't have rotating .sigs, but you can see mine at http://www.ccil.org/~cowan/signatures

Follow-Ups:
- Re: Be careful writing XPath expressions when the XMLcould have non-existent elements
  - From: Liam R E Quin <liam@w3.org>

References:
- Be careful writing XPath expressions when the XML could havenon-existent elements
  - From: "Costello, Roger L." <costello@mitre.org>
- Re: Be careful writing XPath expressions when the XML couldhave non-existent elements
  - From: Wendell Piez <wapiez@wendellpiez.com>

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