Providing the right context to a value is essential for correct interpretation. This is increasingly important when changing from document centric to data centric information. The POSC Caesar PLM RDL includes a vocabulary for statement of such context related to properties.
The blue individuals representing corrosion allowance, normal
operating gas density, upper limit design pressure and lower limit
allowable rotational speed are all typical examples of properties. The
rdf:Type relations to subclasses of the Datum class provide the
Numerical value, quantity type, and unit of measure is managed separately, see pattern Physical Quantity.