Extensible select and enumeration types

and their elements in schema MATHEMATICAL_CONTEXT_SCHEMA taking into account BASED_ON types


 characterized_product_definition - EXTENSIBLE SELECT
          product_definition
          product_definition_relationship

 space_context_select - EXTENSIBLE SELECT
          action
          action_method
          general_property
          product_definition
          representation_item
          shape_aspect

 value_context_select - EXTENSIBLE SELECT
          action
          action_method
          general_property
          product_definition
          representation_item
          shape_aspect