Affects: SAREF

Situation: SAREF contains axioms

Axiom SubClassOf (Measurement ObjectExactCardinality(isMeasuredIn 1 UnitOfMeasure)
Axiom SubClassOf (Measurement ObjectExactCardinality(relatesToProperty 1 Property )

However a Measurement may be about more than one property, and use more than one unit of measure. For example the measurement of strain in deformable solids outpus both force (N) and torque (N.m).

Proposal: remove the two axioms.

Status: discussed during SmartM2M-2nd RG Meeting about 2 NWIs SAREFv3 and SAREF Com Framework V2 2019-05-06 : need simple means to link to a numeric value. Maybe introduce an ObjectProperty hasValueObject (to link to measurement ontologies for example), provide example on how to do so. For example, SAREF4health: the output of a sensor may be a timeseries, which needs to be represented as an individual and not a literal.