ISO/TS 10303-1129:2008 specifies the application module for External properties.

The following are within the scope of ISO/TS 10303-1129:2008:

• identification of a kind of property defined in a property library that is not structured according to ISO 13584-42;
• identification of a kind of property defined in a library structured according to ISO 13584-42;
• items within the scope of application module External library, ISO/TS 10303-1778;
• items within the scope of application module Identification assignment, ISO/TS 10303-1021;
• items within the scope of application module Independent property, ISO/TS 10303-1036;
• items within the scope of application module Plib class reference, ISO/TS 10303-1291.