Re: Problem with "except" operator

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Subject: Re: Problem with "except" operator
From: "G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>
Date: Wed, 11 Feb 2009 09:52:43 -0500

At 2009-02-11 14:38 +0000, Andrew Welch wrote:

> For the (short) example data posted it does not matter but in general I
> think the above should be
>  <xsl:value-of select="$users[not(. = $friends)]"/>
> as that is quite different from $users[. != $friends].

Is that right?  It always takes me a while to "get it" again, but I
think you only need to be concerned about != when both sides are
sequences of more than 1 item.  When the LHS is a single item, it's
ok.

So the above are equivalent.

I think not, Andrew ... Martin is correct. I had already composed a correction to my own answer when I noted that both Martin and you correctly used not(), so I didn't bother sending it.

Consider that when $friends is empty, there will be no $users selected when using:

$users[. != $friends]

... because the predicate will be false for every test.

. . . . . . . . Ken

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