Improve model for schema:DataType

[jaw111]

http://schema.org/DataType

In relation to #217 it would seem from the current hierarchy that schema:DataType is the super-class of schema:Boolean, schema:Date, etc.

This would infer that any literal value is a schema:DataType, which seems illogical.

It would seem more logical that:

• the existing datatype classes have type schema:DataType rather than be a sub-class of it
• a top-level class schema:Literal class is introduced (analogous to rdfs:Literal) of which all the existing data types are a sub-class

The result should be something like:

schema:DataType a rdfs:Class ;
  rdfs:subClassOf schema:Class .

schema:Literal a schema:DataType .

schema:Boolean a schema:DataType ;
  rdfs:subClassOf schema:Literal .

schema:Date a schema:DataType ;
  rdfs:subClassOf schema:Literal .

[danbri]

@rvguha can you take a look?

[rvguha]

Yes, jaw111 is absolutely right. This does mean that DataType is a class of classes.

[danbri]

Thanks. Re-opened as I'm only closing issues once we've addressed them. We'll need to tweak schema.rdfa here...

[danbri]

The vocab side of this is fixed in sdo-gozer, alongside #130. UI/python consequences of the new structure are tracked as #463.