A datatype property that encodes values from a datatype for an Entity. There are several ways to encode values in DOLCE (Ultralite): 1) Directly assert an xsd:_ value to an Entity by using hasDataValue 2) Assert a Region for an Entity by using hasRegion, and then assert an xsd:_ value to that Region, by using hasRegionDataValue 3) Assert a Quality for an Entity by using hasQuality, then assert a Region for that Quality, and assert an xsd:_ value to that Region, by using hasRegionDataValue 4) When the value is required, but not directly observed, assert a Parameter for an xsd:_ value by using hasParameterDataValue, and then associate the Parameter to an Entity by using isConstraintFor 5) When the value is required, but not directly observed, you can also assert a Parameter for a Region by using parametrizes, and then assert an xsd:_ value to that Region, by using hasRegionDataValue The five approaches obey different requirements. For example, a simple value can be easily asserted by using pattern (1), but if one needs to assert an interval between two values, a Region should be introduced to materialize that interval, as pattern (2) suggests. Furthermore, if one needs to distinguish the individual Quality of a value, e.g. the particular nature of the density of a substance, pattern (3) can be used. Patterns (4) and (5) should be used instead when a constraint or a selection is modeled, independently from the actual observation of values in the real world.