Extensible select and enumeration types

and their elements in schema CONSTRUCTIVE_SOLID_GEOMETRY_2D_XIM taking into account BASED_ON types


 constructive_element_select - EXTENSIBLE GENERIC_ENTITY SELECT
          axis2_placement
          curve
          point_select
          surface

 identification_item - EXTENSIBLE SELECT
          shape_representation

 versionable_item - EXTENSIBLE SELECT
          shape_representation