Subject: Re: [xsl] Seek an XPath 2.0 expression that handles an empty text field, regardless of how it's represented in XML From: "Graydon graydon@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Thu, 22 Sep 2016 22:12:52 -0000 |
On Thu, Sep 22, 2016 at 04:01:39PM -0000, G. Ken Holman g.ken.holman@xxxxxxxxx scripsit: > At 2016-09-22 15:55 +0000, Costello, Roger L. costello@xxxxxxxxx wrote: > > I want an XPath 2.0 expression that outputs "do action" if the B field > > is empty, regardless of which of the two XML representations is used. > > This XPath expression seems to work: > > > > if (not(B) or B eq '') then "do action" else "no action" > > This gives you the same result: > > if (not(string(B))) then "do action" else "no action" You could also use if (not(boolean(B))) then "do action" else "no action" which exploits empty strings being false(). Though that's definitely the sort of logic that should get a comment explaining to your future self what you're going. -- Graydon
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