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Fwd: Re: [xsl] Comparison evaluation in XPath (resend)
Subject: Fwd: Re: [xsl] Comparison evaluation in XPath (resend) From: "G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx> Date: Sat, 15 Mar 2003 10:46:02 -0500 |
Date: Fri, 14 Mar 2003 11:43:44 -0500 To: xsl-lists@xxxxxxxxxxxxxxxxxxxxxx From: "G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx> Subject: Re: [xsl] Comparison evaluation in XPath
At 2003-03-13 16:56 -0800, Gregory Murphy wrote:Looking at the grammar for XPath, it appears that the comparison and equality operators are left-associative. So,
x > y > z
should be evaluated as if it were
( x > y ) > z
How then should the value be obtained? If evaluation is performed at each branch of an LALR(1) parse of an XPath expression, then an expression like
3 > 2 > 1
would be reduced first to
true > 1
which would evaluate to false. But shouldn't the answer be true?
Whenever ">" or "<" is used in the operator, both operands are cast to numbers. The number() function on "true()" returns the number 1 ... and 1 is not greater than 1.
I hope this helps.
.............. Ken
-- Upcoming hands-on in-depth XSLT/XPath and/or XSL-FO North America: June 16-20, 2003
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