Extensible select and enumeration types

and their elements in schema Chemical_substance_arm taking into account BASED_ON types


 material_item_select - EXTENSIBLE GENERIC_ENTITY SELECT
          Substance_view_definition

 measure_value - EXTENSIBLE SELECT
          any_number_value
          any_string_value
          length_measure
          plane_angle_measure

 organization_or_person_in_organization_item - EXTENSIBLE SELECT

 property_assignment_select - EXTENSIBLE SELECT

 represented_definition - EXTENSIBLE SELECT
          Assigned_property
          Independent_property

 substance_composition_basis - EXTENSIBLE ENUMERATION
          ATOMS
          MASS
          MOLES
          VOLUME