Extensible select and enumeration types

and their elements in schema Draughting_element_specialisations_arm taking into account BASED_ON types


 appearance_context - EXTENSIBLE GENERIC_ENTITY SELECT
          Representation

 appearance_select - EXTENSIBLE GENERIC_ENTITY SELECT
          Curve_appearance
          Point_appearance
          Text_style

 dimension_callout_select - EXTENSIBLE GENERIC_ENTITY SELECT
          Text

 draughting_callout_content_select - EXTENSIBLE GENERIC_ENTITY SELECT
          Generic_annotation_curve
          Text

 font_select - EXTENSIBLE GENERIC_ENTITY SELECT
          Draughting_pre_defined_text_font
          Externally_defined_text_font

 identification_item - EXTENSIBLE SELECT

 measure_value - EXTENSIBLE SELECT
          any_number_value
          any_string_value
          length_measure
          plane_angle_measure

 overriding_style_context - EXTENSIBLE GENERIC_ENTITY SELECT
          Detailed_geometric_model_element
          Styled_model

 point_select - EXTENSIBLE GENERIC_ENTITY SELECT
          Cartesian_point
          Point_on_curve
          Point_on_surface

 presented_model_select - EXTENSIBLE GENERIC_ENTITY SELECT
          Styled_model

 text_alignment - EXTENSIBLE ENUMERATION
          bottom_centre
          bottom_left
          bottom_right
          centre_centre
          centre_left
          centre_right
          top_centre
          top_left
          top_right

 text_delineation - EXTENSIBLE ENUMERATION
          overline
          underline

 text_or_composite_text - EXTENSIBLE GENERIC_ENTITY SELECT
          Annotation_text
          Composite_presentable_text
          Defined_character_glyph
          Text_literal

 text_string_representation_item_select - EXTENSIBLE GENERIC_ENTITY SELECT
          Annotation_text
          Composite_presentable_text
          Text_literal