Re: () eq () vs () = ()

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Subject: Re: () eq () vs () = ()
From: Michael Kay <mike@xxxxxxxxxxxx>
Date: Fri, 30 Sep 2011 13:30:41 +0100

On 30/09/2011 10:43, Andrew Welch wrote:

I've recently found out (over on the saxon list) that:

() eq ()

returns the empty sequence, but

() = ()

returns false.

To add a little footnote, a couple of weeks ago I had a user who had written

test="contains(a,b) = false"

and in 1.0 this produced the same result as if he had written

test="contains(a,b) = false()"

because in 1.0, when you compare a node-set to a boolean you convert the node-set to a boolean and compare the two booleans, and the node-set false will usually convert to the boolean false(). But in 2.0 his code stopped working because the rules for comparing a node-set to a boolean changed, the WG imagining very few users would do this intentionally...

Michael Kay
Saxonica

Current Thread
Re: () eq () vs () = (), (continued) Andrew Welch - 30 Sep 2011 13:58:06 -0000 David Carlisle - 30 Sep 2011 14:28:36 -0000 Michael Kay - 30 Sep 2011 15:37:03 -0000 Florent Georges - 30 Sep 2011 14:59:28 -0000 Michael Kay - 30 Sep 2011 12:30:53 -0000 <= Markus Abt - 30 Sep 2011 13:23:49 -0000

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Re: () eq () vs () = (), Florent Georges	Thread	Re: () eq () vs () = (), Markus Abt
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