object_role
odd_function
offset_curve_2d
offset_curve_3d
offset_surface
one_direction_repeat_factor
open_path_profile
open_shell
ordinate_dimension
organization
organizational_address
organizational_project
organizational_project_assignment
organizational_project_relationship
organizational_project_role
organization_assignment
organization_relationship
organization_role
oriented_closed_shell
oriented_edge
oriented_face
oriented_open_shell
oriented_path
oriented_surface
or_expression
outer_boundary_curve
over_riding_styled_item