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Use count(distinct-values(/test/row/string(transition))) string() applied to an empty sequence returns the zero-length string, whereas atomization applied to an empty sequence returns an empty sequence. Michael Kay Saxonica > On 26 May 2022, at 15:08, Roger L Costello costello@xxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hi Folks, > > The following XML document has two row elements with no transition element and two row elements with a transition element : > > <test> > <row> > </row> > <row> > </row> > <row> > <transition>ABC</transition> > </row> > <row> > <transition>DEF</transition> > </row> > </test> > > I want a count of the number of distinct transition values, where row elements with no transition element are counted as 1. > > So for the above XML document the count should return 3. > > This XPath seems to work: > > count(distinct-values(/test/row/transition)) + count(/test/row[not(transition)][1]) > > But I am wondering if there is a better (simpler, less kludgy) XPath expression? > > /Roger
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