E.1 General

This annex documents the history of technical modifications made to ISO/TS 10303-506.

Unless otherwise specified all modifications are upwardly compatible to the previous edition. Modifications to EXPRESS specifications are upwardly compatible if:

• instances encoded according to ISO 10303-21, and that conform to an ISO 10303 application protocol based on the previous edition of this part of ISO 10303, also conform to a revision of that application protocol based on this edition of this part of ISO 10303;
• interfaces that conform to ISO 10303-22 and to an ISO 10303 application protocol based on the previous edition of this part of ISO 10303, also conform to a revision of that application protocol based on this edition of this part of ISO 10303;
• the mapping tables of ISO 10303 application protocols based on the previous edition of this part of ISO 10303 remain valid in a revision of that application protocol based on this edition of this part of ISO 10303.

E.2 Changes made in edition 2

E.2.1 Summary of changes

The second edition of this part of ISO 10303 incorporated the modifications to the first edition listed below.

E.2.2 Changes made to schema aic_draughting_elements

The following EXPRESS declarations and interface specifications have been modified:

• ENTITY draughting_elements;
• ENTITY leader_directed_dimension.

E.3 Changes made in edition 3

E.3.1 Summary of changes

This third edition of this part of ISO 10303 incorporates the modifications to the second edition listed below.

NOTE    The change occurred in a description in ENTITY type draughting_elements and no EXPRESS changes were made in the aic_draughting_elements. Because no EXPRESS declarations were modified, the aic_draughting_elements schema version identifier was not changed.

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