I’m creating test cases for validating different data types and reached the DV_INTERVAL. By the model, we could have DV_INTERVAL<DV_ORDERED> which means intervals of DV_ORDINAL, DV_SCALE and DV_PROPORTION are valid, but in modeling tools an implementations I only saw intervals of DV_COUNT, DV_QUANTITY, DV_DURATION, DV_DATE_TIME, DV_DATE and DV_TIME.

Does it make sense to have intervals of ordinal, scale and proportion? Or is just that current implementations lack those types in the interval upper and lower limits?

(I’m not looking for use cases, just to understand what the model allows and if that makes sense)