Here the Step Write RoadMap:
    - General Improvement
        - On AP242 : AP242E1 (Edition 1), AP242E2 (Edition 2) AP242E3 (Edition 3) are supported
        - And AP242 BO XML (Domain XML) is supported (assembly structure)
        - Following enhancements and improvements coming in AP242E3 (Edition 3)
        - Compressed STEP files
        - Parser : interoperability between protocols

    - Dimensioning and Tolerancing (also known as FDT or PMI)
        - Construction Geometries : infinite geometries (planes, lines)
        - AP242 : continuing on Semantic definitions, on Graphics as Placeholder (minimal graphics)
        - FDT in an Assembly : with external element references (see below)
        - Continuing on 3D Views : Section Views with several planes
        - future : Machining Features, firstly Hole Feature

    - Attributes
        - Add Color/Layer on Assembly Instances
        - Read and Write validation properties for geometry, tessellation, assemblies, PMI

    - External References
        - External Element References in AP242 (used in PMI in Assembly, Kinematics, etc): general support

    - Tessellation
        - new tessellation introduced in STEP AP242 is now supported