Re: Constraints on classes

Holger, I think I explained it clearly, although not in words that you 
would use. We can't all be you, after all.

So I attach an actual file.

kc

On 4/24/15 7:19 PM, Holger Knublauch wrote:
>
>
> On 4/24/15 11:56 PM, Karen Coyle wrote:
>> I've been trying to understand if this is covered by existing
>> requirements or not...
>>
>> The Dublin Core set of requirements for application profiles
>> (including validation)[1] has some constraints based on classes (read:
>> rdf:type) not properties. For example,
>>
>> - For every node/graph of type edm:CHO there must also be a linked
>> node/graph of type ore:Aggregation.
>
> Could you clarify what you mean with "node/graph"? Do you assume a
> certain architecture in which each subject resource lives in its own
> graph? Also, is the property known or is it "any" (wildcard) linked
> property? If it's a known property, and assuming you mean "node" instead
> of "graph" then this could be expressed via
>
> edm:CHO
>      sh:property [
>          sh:predicate edm:someProperty ;
>          sh:valueType ore:Aggregation ;
>          sh:minCount 1 ;
>      ] .
>
>>
>> - For every node/graph of type ex:Book there can be 0..n linked nodes
>> of type ex:Author, but no nodes of type ex:Composer.
>
> You didn't provide enough information to model this. Do you have two
> properties ex:author and ex:composer, or are they all values of the same
> property? In the former case this could be:
>
> ex:Book
>      sh:property [
>          sh:predicate ex:author ;
>          sh:valueType ex:Author ;
>      ] ;
>      sh:property [
>          sh:predicate ex:composer ;
>          sh:maxCount 0 ;
>      ] ;
>
> (or maybe also sh:constraint sh:ClosedShape instead of the ex:composer
> restriction).
>
> HTH
> Holger
>
>>
>>
>> I asked this many moons ago and was assured that it was included in
>> the existing requirements, but if it's there I haven't identified it.
>> Is this covered, or do I need to add a story+requirement proposal?
>>
>> BTW, we are doing an analysis comparing the DCMI requirements with
>> this group's requirements. This is one of the more significant gaps.
>>
>> Thanks,
>> kc
>>
>>
>> [1]
>> http://wiki.dublincore.org/index.php/RDF_Application_Profiles/Requirements
>>
>
>
>

-- 
Karen Coyle
kcoyle@kcoyle.net http://kcoyle.net
m: 1-510-435-8234
skype: kcoylenet/+1-510-984-3600