Re: [xsl] How to count the distinct values where elements with missing child are counted as one of the distinct values?

["Wendell Piez wapiez@xxxxxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Hi,

Another question is whether one assumes that row elements with no
transition should be counted together as a single value, or separately as
distinct values (because undefined).

The original spec I think may have been ambiguous as to this question. ("I
want a count of the number of distinct transition values, where row
elements with no transition element are counted as 1".)

let $test := /test/row return count(distinct-values($test/transition)) +
count($test[not(transition)])

Also, although XPath was requested XSLT ain't so hard either

<xsl:for-each-group select="/test/row" group-by="transition">
  <xsl:sequence select="count(current-group())"/>
</xsl:for-each-group>

or some variant depending on your needs.

Cheers, Wendell






On Fri, May 27, 2022 at 11:10 AM Dimitre Novatchev dnovatchev@xxxxxxxxx <
xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

> > Use count(distinct-values(/test/row/string(transition)))
>
> I would use the more obvious and self-explanatory:
>
> let $test := /test/row
>   return
>      count(distinct-values($test/transition)) + 1[$test[not(transition)]]
>
> If this XPath evaluation is initiated from an XSLT transformation and XSLT
> 1.0 compatibility set to true (Specifying version = "1.0" but using an XSLT
> 2.0 or later processor), one can use even:
>
>  count(distinct-values(/test/row/transition)) +
> boolean(/test/row[not(transition)])
>
>
> Thanks,
> Dimitre
>
> On Thu, May 26, 2022 at 7:33 AM Michael Kay mike@xxxxxxxxxxxx <
> xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>> 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
>> >
>> >
>>
>>
>>
>
> --
> Cheers,
> Dimitre Novatchev
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