properties relevant to dco:GeoSample

[xgmachina]

Added and updated a few properties, by referring to the CSIRO IGSN metadata schema.

[xgmachina]

I was reading the subclass restrictions in the current definition of dco:GeoSample. Do they mean the required attributes of a geo-sample?

dco:GeoSample
      a       owl:Class ;
      rdfs:label "GeoSample"@en-US ;
      rdfs:subClassOf vivo:InformationResource ;
      ### May need to discuss the restrictions below if they mean to be the REQUIRED properties of a sample
      rdfs:subClassOf
              [ a       owl:Restriction ;
                owl:allValuesFrom rdfs:Literal ;
                owl:onProperty dco:hasElevation
              ] ;
      rdfs:subClassOf
              [ a       owl:Restriction ;
                owl:allValuesFrom rdfs:Literal ;
                owl:onProperty dco:hasMaterial
              ] ;
      rdfs:subClassOf
              [ a       owl:Restriction ;
                owl:allValuesFrom rdfs:Literal ;
                owl:onProperty dco:hasLongitude
              ] ;
      rdfs:subClassOf
              [ a       owl:Restriction ;
                owl:allValuesFrom rdfs:Literal ;
                owl:onProperty dco:hasLatitude
              ] ;
      rdfs:subClassOf
              [ a       owl:Restriction ;
                owl:allValuesFrom rdfs:Literal ;
                owl:onProperty dco:hasSampleAge
              ] ;
      rdfs:comment  """
      A specimen or small quantity of a geophysical material.
      """^^rdf:XMLLiteral .

[zednis]

@xgmachina that is the owl:allValuesFrom restriction which means that if the property exists it must have the type described in the restriction. It does not mean the property must be present.

I do not think that is a useful class restriction in this case; it would be better to just provide a rdfs:range on the select properties.

[zednis]

for example:

dco:GeoSample
      a       owl:Class ;
      rdfs:label "GeoSample"@en-US ;
      rdfs:subClassOf vivo:InformationResource ;
      rdfs:subClassOf
              [ a       owl:Restriction ;
                owl:allValuesFrom rdfs:Literal ;
                owl:onProperty dco:hasElevation
              ] .

essentially means "If a dco:Geosample instance has property dco:hasElevation then the object of that property can be inferred to have type rdfs:Literal"

This is a useful class restriction if the type of the subject changes the expectation of the object type for a given property.

In this case though, I think we should just provide a range on the property and remove these restrictions.

[xgmachina]

Thanks @zednis I will made further updates on this. Perhaps will remove them.

[zednis]

If you want to assert that there is an elevation, material, longitude, latitude, etc for each sample you should use the owl:someValuesFrom restriction, but even then it is not a requirement but a statement that for each instance of type T the existence of property P is inferable.

http://www.w3.org/TR/owl-ref/#someValuesFrom-def:

The owl:someValuesFrom constraint is analogous to the existential quantifier of Predicate logic - for each instance of the class that is being defined, there exists at least one value for P that fulfills the constraint.

[zednis]

Is this superceded by the current sample + sample repository efforts?

[mrpatrickwest]

I think so. I say we delete this branch and create a new one

[zednis]

I agree. New branch.