A face is a bounded portion of a shell. It is orientable (though not oriented) since two region boundaries (shells) may use different sides of the same face. Strictly speaking, a face consists of the piece of surface it covers, but does not include its boundaries.

bounding_ring (O: SET[0:?] ring(face))

Defines the set of rings which form the boundary of the face. For example, a polygon can be bounded by one ring while a face with a hole in it can be bounded by two rings. Each face may be bounded by one or more ring.


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

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


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 face 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 face 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 face 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 face may be primarily involved in one or more topological_relationship. Inherited from topological_object.


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

Each face may have a property of one or more pty_area.


pty_geometry_2d_face (V: SET[0:?] pty_geometry_2d_face(face))

Each face may have a property of one or more pty_geometry_2d_face.


pty_geometry_3d_face (V: SET[0:?] pty_geometry_3d_face(face))

Each face may have a property of one or more pty_geometry_3d_face.


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 face may be involved in one or more topological_relationship. Inherited from topological_object.


shell (O: SET[0:?] shell(face))

Defines the shells of which this face is a component. Each face may be a component of one or more shell.


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 face may be the result of one space_time_operation. Inherited from topological_object.

Local rules:

Abstract supertype:
Each FACE must be instantiated as one of its subtypes. These subtypes are: area_element, earth_position_face, earth_surface_area, other_face, vertical_datum, wellbore_face
Supertype path(s):
topological_object > spatial_object > simple_spatial_object > face.

Entity replicated into subtype tables (@face).

Referenced in Diagrams:

• CS3: Coordinate Transformations
• CT2: Earth Surface Topology (0712)
• DMG3: Graphic Topology
• GPV: Velocity Data (1226)
• SM1: Spatial Model Topology Hierarchy
• SM2: Spatial Model Properties
• SM4: Spatial Model Architecture
• SM5: Other Spatial Object