Add predicate isSpecifiedBy

[rjyounes]

I find myself defining this quite frequently in client ontologies, and I don't have a need to instantiate a Specification object. I can't find anything suitable in gist, so I propose adding it.

[Jamie-SA]

Discussion:

• Seems like this can be tricky to get the meaning well defined and correct.

Katie is looking at this on a project so has input on some requirements & Heather as well. They offered to dig in a little more and get back to the group.

[uscholdm]

I have had a isSpecifiedBy property for a long time in the context of a smallish sub-ontology for specifications. Here is one being actively used by one of our clients.

spec:isSpecifiedBy
	a owl:ObjectProperty ;
	skos:definition "Relates something to a particular entry in an overall specification."^^xsd:string ;
	skos:prefLabel "is specified by"^^xsd:string ;
	.

spec:SpecEntry
	a owl:Class ;
	owl:equivalentClass [
		a owl:Class ;
		owl:intersectionOf (
			gist:Specification
			[
				a owl:Restriction ;
				owl:onProperty spec:ofCharacteristic ;
				owl:someValuesFrom spec:Characteristic ;
			]
			[
				a owl:Restriction ;
				owl:onProperty gist:specifiedValue ;
				owl:someValuesFrom [
					a owl:Class ;
					owl:unionOf (
						gist:Category
						gist:Magnitude
					) ;
				] ;
			]
		) ;
	] ;
	skos:definition "Specifies values for a particular characteristic indicating what it means to be in spec for that characteristic. Often this will be what is required, allowed or promised, but it could also be used to specify what is not allowed.  The values will typically be numerical with some unit of measure specified."^^xsd:string ;
	skos:prefLabel "Spec Entry"^^xsd:string ;
	skos:scopeNote "Sets of allowed values may also come from a Nominal or Ordinal scale of measure."^^xsd:string ;
	.

For example, Brent crude is a grade of crude oil that must have no more than a certain percent of sulfur. So one spec entry for Brent crude means: "sulfur concentration less than .37%" This is described in a gist council August 2019. Here is a slide depicting how this works.

[rjyounes]

In gistHR we've decided to use isSpecifiedBy

[rjyounes]

See comments on duplicate issues #525 and #1000.

[rjyounes]

Note that this is different from gist:conformsTo: a product may be specified by a product specification but wasn't manufactured correctly so doesn't conform to the spec.