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This part of ISO 13584 specifies a representation category called basic_geometry. This representation category captures the generic concepts of the shape of a part. This representation category may be associated with any of the items defined in a parts library. This part of ISO 13584 also defines how representations that belong to this representation category may be exchanged within a library exchange context by means of FORTRAN programs compliant with ISO 13584-31:1999. The following are within the scope of this part ISO 13584: — the definition of the basic_geometry representation category and the mechanisms to be used to reference it; — the properties to be used to characterize a particular representation within the basic_geometry representation category; — the exchange format to be used for the library external files that describe the basic_geometry representations of classes of items described in a parts library by means of FORTRAN programs based on the application programming interface specified in ISO 13584-31:1999; — the mechanism to be used, by case of separate agreement between the sender and the receiver, to reference external files that describe the basic_geometry representations of classes of items described in a parts library by means of formats not specified in ISO 13584; — the implementation resources to be supported on any implementation that claims conformance to this part of ISO 13584; — the dictionary entries to be supported by any implementation that claims conformance to this part of ISO 13584; — the standard data to be recognized by any implementation that claims conformance to this part of ISO 13584. The following is outside the scope of this part of ISO 13584: — the structure and exchange format of a library delivery file that includes references to the representation category defined in this part of ISO 13584, and/or to the library external files whose exchange format is specified.