Just to follow up on that last example, which even I don't think should
ever work, here's another that I was nearly certain would do something:
ex:AggregateRatingShape
a sh:NodeShape ;
sh:property [
sh:path schema:reviewCount ;
sh:or (
[ sh:minCount 1 ]
[ sh:node [
sh:property [
sh:path (
[ sh:inversePath schema:reviewCount ]
schema:ratingCount );
sh:minCount 1 ;
] ;
];
]
) ;
];
sh:targetClass schema:AggregateRating ;
.
And this is where I'd like to ask some naive questions about sh:inversePath
in the parent/child example, the schema:children triple doesn't actually
exist however the value is inferred, given sh:values by tracing an incoming
sh:inversePath schema:parent. Is it fair to say that a sh:property (or
PropertyShape) uses sh:path to "place the context pointer" at the Object
value? (ie ?s ?path ?Object) and so we test datatype, class etc of that
graph node, and sh:node would place us also at that Object? I had hoped
that from sh:node I could draw a sh:inversePath back to give me the ?s of
this triple, ie the instance of the class that the NodeShape lists as
sh:targetClass, and so, from there, I had hoped to draw a new sh:path out
to that alternate schema:ratingCount value to test for a minCount. I get
confused just describing it.
if I use sh:inversePath at the sh:NodeShape level (outside of sh:property
blocks) does this make the context now some subject ?s that links to this
sh:targetClass instance via the property provided as the 'argument' to
sh:inversePath, while using it within sh:PropertyShape it is referring to
?Object indicated by the shape's sh:path?
I'm thinking that what I really want to do is use sh:sparql or sh:ask ...
On Thu, Feb 20, 2020 at 9:25 AM Gary Murphy <[email protected]> wrote:
> 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
>
--
Gary Lawrence Murphy <[email protected]> - Hunch Manifest, 15 Wyndham N
'C', Guelph
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