Hi Tim,
have you tried
https://www.w3.org/TR/shacl/#QualifiedValueShapeConstraintComponent with
min count and max count 1 and sh:class? You need three property shapes
on the same property.
Holger
On 3/07/2021 7:51 am, Tim Smith wrote:
Hi,
I have a need to model this constraint in SHACL:
/*An Entertainment Holding Company must own one and only one instance
of EACH of the following classes: Movie Company, Racing Company, and
Streaming Company in order to be a valid instance of Entertainment
Holding Company.*/
This is an example of a valid instance:
image.png
Any more or less than 3 st:owns triples or more or less than 1
instance of the three classes listed above should be a violation.
I have tried numerous ways to model this behavior without success.
SHACL seems to iterate through each object of the st:owns property
where I'm making a statement about the set of st:owns objects. I
encounter this type of problem frequently so I'm hoping there is a
pattern I can apply as a generic solution. Something like sh:and but
where sh:and would look across all objects of sh:path.
Am I missing something simple? The one solution that I know works is
the one that I cannot use - creating a new property and property shape
for each class e.g. st:ownsMovieCompany. If this is the only
solution, then I can never use a "generic" property like "owns",
"category", etc.... This will result in a property explosion and
would rapidly become unworkable in industry-sized models.
Thanks in advance for your input,
Tim
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