Re: [xsl] XPath that returns nothing

incidentally () is the _only_ expression that is guaranteed to return nothing and to be safe in a schema aware xslt2 processor. Other expressions that may statically be determined empty may raise an error.

No, that's not quite true in XQuery and even less true in XSLT. XSLT doesn't do pessimistic static type checking. Even in XQuery, you're not allowed to raise a static error for something like

*[current-date() lt xs:date('1900-01-01')]

(which is 'guaranteed to return nothing' but cannot, strictly speaking, 'statically be determined empty')

Michael Kay
Saxonica

Current Thread
Re: [xsl] XPath that returns nothing, (continued) Florent Georges - 27 Sep 2011 11:58:54 -0000 Andrew Welch - 27 Sep 2011 08:43:00 -0000 Vasu Chakkera - 28 Sep 2011 05:35:46 -0000 David Carlisle - 28 Sep 2011 09:01:54 -0000 Michael Kay - 28 Sep 2011 09:57:08 -0000 <= David Carlisle - 28 Sep 2011 10:10:44 -0000 Andrew Welch - 28 Sep 2011 10:11:22 -0000 David Carlisle - 28 Sep 2011 10:14:13 -0000 Andrew Welch - 28 Sep 2011 10:18:23 -0000

Current Thread

Re: [xsl] XPath that returns nothing, (continued)
- Andrew Welch - 27 Sep 2011 08:43:00 -0000
  - Vasu Chakkera - 28 Sep 2011 05:35:46 -0000
  - David Carlisle - 28 Sep 2011 09:01:54 -0000
    - Michael Kay - 28 Sep 2011 09:57:08 -0000 <=
    - David Carlisle - 28 Sep 2011 10:10:44 -0000
    - Andrew Welch - 28 Sep 2011 10:11:22 -0000
    - David Carlisle - 28 Sep 2011 10:14:13 -0000
    - Andrew Welch - 28 Sep 2011 10:18:23 -0000

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