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

2022-05-27 13:09:17
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(_at_)gmail(_dot_)com <
xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> 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(_at_)saxonica(_dot_)com <
xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> 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(_at_)mitre(_dot_)org <
xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> 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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