PDM-UG: Measure and units

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This page belongs to the PDM Usage Guide.

A measure with unit is the specification of a physical quantity as defined in ISO31 (clause 2). The PDM Schema allows specifying different measure with units used for, e.g., a property definition or quantity of an assembly relationship. A measure with unit is characterized by two components, a value specifying the quantity and a unit in which the value is expressed.

The PDM Schema supports the application of:

  • simple units including predefined SI units according to ISO1000 (clause 2);
  • converted units which are derived from another unit by a conversion factor;
  • derived units which are defined by an expression of units;
  • user defined units which are dependent on a specific context and which are not related to the system of units within the PDM Schema.
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