Provides a choice of one of a scalar, vector or tensor measurement for a physical property measurement For swe:Quantity, use the swe:definition attribute (URI in SWE1, ScopedName in SWE2) to describe the statistical type of the quoted measurement (eg, mean, minimum, maximum, median, mode, single measurement). Recommended vocabulary for statistaical terms is at http://dictionary.uncertml.org/statistics. Use UCUM where possible for units of measure.