Yes, that was my original approach, but since the path is reported as a
blank node, the alternativePath itself, and not the specific alternative
that tripped the violation, I've lost the path information. I know it is
an unusual and extraneous demand, but legacy code wants to know ....
using the message to decide is an awkward possibility. It means
dual-purposing a data item and it also forms a technical debt should the
application someday support other languages.
I also tried convoluted paths in hopes of chaining inversePath with the
alternate as a path list, and then using that in an sh:or like
sh:path schema:ratingCount ;
sh:or (
[ sh:path ( [ sh:inversePath schema:ratingCount ] schema:reviewCount )
; minCount 1 ]
[ sh:minCount 1 ]
);
but needless to say that didn't work either. It seemed like a good idea at
the time, and I'm not at all certain I fully understand inversePath, but
when the engine gets to the second sh:or case I think it is saying that it
doesn't know who this minCount is referencing.
On Wed, Feb 19, 2020 at 8:21 PM Holger Knublauch <[email protected]>
wrote:
> I think a path of ratingCount|reviewCount with sh:minCount 1 is the
> cleanest approach. So if the blank node isn't very meaningful yet, maybe
> you'd need to adjust the results display accordingly? You could also
> specify a nice sh:message to explain what's really going on at the property
> shape.
>
> ex:AggregateRatingShape
> a sh:NodeShape ;
> sh:targetClass schema:AggregateRating ;
> sh:property [
> sh:path [ sh:alternativePath ( schema:ratingCount
> schema:reviewCount ) ] ;
> sh:minCount 1 ;
> sh:message "AggregateRating can have either or both of ratingCount
> and reviewCount" ;
> ] .
>
> Of course you'd also need the individual property shapes for the two
> properties, with no sh:minCount.
>
> Alternatively, use sh:or at the node shape, yet that might even be more
> complicating.
>
> Holger
>
>
> On 20/02/2020 07:31, Gary Murphy wrote:
>
> I have an application where I use the validation sh:resultPath to display
> violation messages, but I've hit a conundrum with dependent/contingent
> properties
>
> a simple example: schema:AggregateRating can have either or both of
> ratingCount and reviewCount, with a structure as follows:
>
> {
> "@context": { "@vocab": "http://schema.org/"; },
> "@type": "AggregateRating",
> "ratingCount": 25,
> "ratingValue": "3.5",
> "reviewCount": 5,
> "@id": "http://schemaapp.com/db/SchemaApp#AggregateRating";
> }
>
> what I would like to do is to attach a PropertyShape with a sh:path
> schema:reviewCount that will pass if either (or both) properties are
> present, but return a violation (with sh:resultPath schema:reviewCount) if
> both are missing
>
> It was very easy to phrase using sh:alternativePath in a NodeShape, but
> that gives the sh:alternativePath blank node as the resultPath. I might be
> stuck with that, but hoping there's a way to do it the way I need
> --
> Gary Lawrence Murphy <[email protected]> - Hunch Manifest, 15 Wyndham N
> 'C', Guelph
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--
Gary Lawrence Murphy <[email protected]> - Hunch Manifest, 15 Wyndham N
'C', Guelph
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