ISO/TS 10303-1275:2004 specifies the application module for
External class.
The following are within the scope of
ISO/TS 10303-1275:2004:
-
The identification of a class that is external to a data exchange file;
-
The identification of an external class library that is not in an
exchange file and holds the definition for classes used in the
exchange file;
-
A reference to a class in an external class library.