ISO 10303-214:2010(E)
A Property is the definition of a particular quality.
NOTE A property may reflect physics or arbitrary user defined measurements.
Each Property is a Cost_property, a Quality_property, a Duration_property, a Material_property, a General_property, a Recyclability_property, or a Mass_property.
The data associated with a Property are the following:
The allowed_unit specifies the unit or set of units that are accepted.
EXAMPLE A company may accept a mass specified in kilograms or tons, but not in grams or pounds.
A Property_value representing the Property shall not be expressed with a Unit that is not contained in the allowed_unit, if the allowed_unit is specified. If specified, the 'global_unit' attribute of a Property_value_representation representing the Property shall be contained in the allowed_unit, if the allowed_unit is specified.See property to unit for the application assertion.
The description specifies additional information about the Property.
See property to multi_language_string for the application assertion.
The description need not be specified for a particular Property.
If present, there shall be exactly one object that defines the description for a Property.
The id specifies the identifier of the Property.
The property_source specifies the External_library_reference or Plib_property_reference object that defines this kind of property.
See property to external_library_reference and property to plib_property_reference for the application assertions.
The property_source need not be specified for a particular Property.
If present, there shall be exactly one object that defines the property_source for a Property.
The version_id specifies the identification of a particular version of a Property.
The version_id need not be specified for a particular Property.
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