Extensible select and enumeration types

and their elements in schema Generic_material_aspects_arm taking into account BASED_ON types


 material_item_select - EXTENSIBLE GENERIC_ENTITY SELECT

 measure_value - EXTENSIBLE SELECT
          any_number_value
          any_string_value
          length_measure
          plane_angle_measure

 property_assignment_select - EXTENSIBLE SELECT

 represented_definition - EXTENSIBLE SELECT
          Assigned_property
          Independent_property