NullPower

Overview

Data type

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

Supertypes

• NullablePower

Implementation in Proteus Schema

All data attributes with type NullablePower (the base type of NullPower) 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_POWER (e.g., see the implementation example for the attribute DesignShaftPower of the DEXPI class Agglomerator). For a null value, the attributes Units, UnitsURI, and Value must not be used.