A connected boundary of a single face. A face may have one or more rings, for example a polygon would require one ring while a face with a hole in it would require two rings. Rings may consist of an alternating sequence of edges and vertices in a complete circuit. Rings are also orientable but not oriented.

earth_model (I, V: SET[0:?] earth_model(spatial_object))

Indicates various earth models which include this spatial representation. Each ring may be part of one or more earth_model. Inherited from spatial_object.


edge (V: SET[0:?] edge(ring))

Defines the edges which compose this ring. Each ring may be composed of one or more edge.


face (V: SET[0:?] face(bounding_ring))

Defines the set of faces for which this ring forms part of the boundary of the face. Each ring may bind one or more face.


intersection_role (I, V: SET[0:?] space_time_operation(intersecting_object))

Indicates a space/time operation for which the object is involved as an intersecting agent. For projection, this is the screen on which an object is being projected. For proximity, this is the magnet object. Each ring may be the intersecting object for one or more space_time_operation. Inherited from topological_object.


other_composite_spatial_object (I, V: SET[0:?] other_composite_spatial_object(composite_object))

Defines the set of composite spatial objects of which this spatial object is a component. Each ring may be a component of one or more other_composite_spatial_object. Inherited from spatial_object.


primary_role (I, V: SET[0:?] space_time_operation(primary_object))

Indicates a space/time operation for which the object is involved as a primary agent. For degeneration, this object is being degenerated. For projection, this object is being projected onto another object. For proximity, this is the container object. Each ring may be the primary object for one or more space_time_operation. Inherited from topological_object.


primary_topological_relationship (I, V: SET[0:?] topological_relationship(primary_topological_object))

Indicates a topological relationship in which the topologic object has the role of primary agent. For an object intersection type of "inside" this is the containing role (e.g., if a city is inside a county then the county would be the primary agent). For all other object intersection types the roles are symmetrical and both relationships must be searched for a particular object. For example, if a wellbore and a formation overlap then either could be chosen as the primary agent with the other chosen as the secondary agent. Each ring may be primarily involved in one or more topological_relationship. Inherited from topological_object.


pty_geometry_2d_ring (V: SET[0:?] pty_geometry_2d_ring(ring))

Each ring may have a property of one or more pty_geometry_2d_ring.


pty_geometry_3d_ring (V: SET[0:?] pty_geometry_3d_ring(ring))

Each ring may have a property of one or more pty_geometry_3d_ring.


secondary_topological_relationship (I, V: SET[0:?] topological_relationship(secondary_topological_object))

Indicates a topological relationship in which the object is in the role of secondary agent. For an object intersection type of "inside" this is the contained role (e.g., if a well is inside a field then the well would be the secondary agent). For all other object intersection types the roles are symmetrical and both relationships must be searched for a particular object. For example, if a wellbore and a formation overlap then either could be chosen as the secondary agent with the other chosen as the primary agent. Each ring may be involved in one or more topological_relationship. Inherited from topological_object.


source_space_time_operation (I, V: BAG[0:1] space_time_operation(resulting_object))

Indicates the space/time operation from which a topological object was the result. For addition, this is the union of two objects. For degeneration, this is the degenerate object. Each ring may be the result of one space_time_operation. Inherited from topological_object.

Local rules:

Abstract supertype:
Each RING must be instantiated as one of its subtypes. These subtypes are: earth_position_ring, earth_surface_boundary, other_ring, ring_element, wellbore_ring
Supertype path(s):
topological_object > spatial_object > simple_spatial_object > ring.

Entity replicated into subtype tables (@ring).

Referenced in Diagrams:

• CT2: Earth Surface Topology (0712)
• DMG3: Graphic Topology
• SM1: Spatial Model Topology Hierarchy
• SM2: Spatial Model Properties
• SM5: Other Spatial Object