Extensible select and enumeration types

and their elements in schema MESH_CONNECTIVITY_SCHEMA taking into account BASED_ON types


 characterized_product_definition - EXTENSIBLE SELECT
          product_definition
          product_definition_relationship

 mesh_location - EXTENSIBLE ENUMERATION
          application_defined
          cell_centre
          edge_centre
          face_centre
          iface_centre
          jface_centre
          kface_centre
          unspecified
          vertices

 mismatched_region_type - EXTENSIBLE ENUMERATION
          abutting
          overset

 property_distribution_select - EXTENSIBLE SELECT
          action_property
          general_property_relationship
          property_definition
          resource_property

 space_context_select - EXTENSIBLE SELECT
          action
          action_method
          general_property
          product_definition
          representation_item
          shape_aspect

 structured_mesh_type - EXTENSIBLE ENUMERATION
          pentahedral
          pyramidal
          rectangular
          tetrahedral