Is there a vision or guide for discrete states and enumerations?

[hicksjacobp]

I see qudt:DiscreteState is defined in schema/SCHEMA_QUDT-DATATYPE-v2.1.ttl, but I see there are only 3 sub-classes: qudt:OnOffStateType, qudt:OpenCloseStateType, and qudt:WetDryStateType.

I then see that these 3 sub-classes go on to further define possible values of those states, for example:

qudt:On
  a qudt:OnOffStateType ;
  qudt:code "1" ;
  qudt:literal "on" ;
  rdfs:isDefinedBy <http://qudt.org/2.1/schema/datatype> ;
  rdfs:label "On" ;
.

However, I see that:

• qudt:code is marked as deprecated in schema/SCHEMA_QUDT-v2.1.ttl
• qudt:literal has a sub-class of qudt:symbol, but I don't understand the difference of when to use one over the other and the qudt:On example uses qudt:literal instead of qudt:symbol. qudt:EnumeratedValue has a constraint to be a sub-class of a qudt:symbol, and not qudt:literal.

I also see qudt:Enumeration in schema/SCHEMA_QUDT-DATATYPE-v2.1.ttl which I assume would allow one to define a set of discrete states that belong together.

I see that qudt:DiscreteState is a sub-class of qudt:EnumeratedValue, which has a few more examples not considered discrete states and also aren't considered enumerations.

And I can't seem to find much written guidance around enumerations throughout the QUDT website or GitHub repository. So I'm just looking for some insight and possible direction of where this ontology is taking enumerated values / states.

[steveraysteveray]

Speaking just for myself, this is a part of the QUDT ontology that has not been updated in years. Our focus has been on Quantifiable values, i.e. those that have a numerical value, rather than enumerations. As you correctly point out, the notion of enumerations is present in the ontology, but I haven't taken a look at that part of the model and am not surprised if there are some inconsistencies.
I don't pretend to speak for my colleagues at QUDT.org, though!

[PeteHazelberg]

Thanks @steveraysteveray for taking the time to weigh in with your perspective. That's helpful information.