NullMass

Overview

Data type

A null value for a physical quantity of type NullableMass. The only instance of this singleton type is NULL_MASS.

Supertypes

• NullableMass

Implementation in Proteus Schema

All data attributes with type NullableMass (the base type of NullMass) are implemented as DEXPI generic attributes for physical quantities.

Example

Implementation in Proteus Schema

<GenericAttribute
  Format="double" ...>

Note that the <GenericAttribute> element must have a Name and an AttributeURI attribute. They depend on the data type attribute of the DEXPI class that owns the null instance NULL_MASS (e.g., see the implementation example for the attribute UpperLimitDesignLoad of the DEXPI class BatchWeigher). For a null value, the attributes Units, UnitsURI, and Value must not be used.