help with counting things in SHACL

[cbur...@healthwise.org]

So I have written a few sh:values rules that count how many values of particular property shapes exist in a graph:

These are all powered by simple sh:values statements, like this:

  sh:values [
      sh:count [
          sh:path enterprise_schemas:whatIs ;
        ] ;
    ] ;

Now I want to count how many of those property shapes are currently returning "0" as a value -- in this example, the expected count would be 1 -- and return that as the value of an additional property shape, ex:gapCount.

Can we do this with SHACL? It seems like it should be possible. I've played around with various combinations of sh:count, sh:alternativePath, and so on, but haven't hit upon a way that works and would love some advice.

Carl

[Holger Knublauch]

Yes, sh:values rules can access other properties that are also computed via sh:values. But for this to work, you are limited to using

sh:path ex:someInferredProperty

no path expressions like alternativePath will work for those. I guess you could try to express this via https://w3c.github.io/shacl/shacl-af/#union

Holger

On 26 Apr 2023, at 5:54 pm, cbur...@healthwise.org <cbur...@healthwise.org> wrote:

So I have written a few sh:values rules that count how many values of particular property shapes exist in a graph:

<Screenshot 2023-04-26 094626.jpg>

These are all powered by simple sh:values statements, like this:

  sh:values [
      sh:count [
          sh:path enterprise_schemas:whatIs ;
        ] ;
    ] ;

Now I want to count how many of those property shapes are currently returning "0" as a value -- in this example, the expected count would be 1 -- and return that as the value of an additional property shape, ex:gapCount.

Can we do this with SHACL? It seems like it should be possible. I've played around with various combinations of sh:count, sh:alternativePath, and so on, but haven't hit upon a way that works and would love some advice.

Carl

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<Screenshot 2023-04-26 094626.jpg>