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How to count the distinct values where elements with

Subject: How to count the distinct values where elements with missing child are counted as one of the distinct values?
From: "Roger L Costello costello@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 26 May 2022 14:08:36 -0000
 How to count the distinct values where elements with
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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