Defines the topology between two topological objects. For example, a city may be defined to be "inside" a county.

boundary_overlap (M, K: ndt_logical)

Boundary overlap qualifies whether or not the two objects have at least partially one of their boundaries in common. True indicates that they overlap. False indicates that they do not even partially overlap.


end_time (O, K, I: ndt_date_tod)

End time of the association. Inherited from transient_association.


ref_object_intersection (M, K: ref_object_intersection)

Object Intersection qualifies the result of the intersection between two objects primary and secondary. The result could be empty, equal, inside or overlap.


start_time (O, K, I: ndt_date_tod)

Start time of the association. Inherited from transient_association.


primary_topological_object (M, K: topological_object(primary_topological_relationship))

Indicates a topologic object in the role of primary agent. For an object intersection type of "inside" this is the containing object (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 topological_relationship must primarily involve one topological_object.


secondary_topological_object (M, K: topological_object(secondary_topological_relationship))

Indicates a topologic object in the role of secondary agent in the topological relationship. For an object intersection type of "inside" this is the contained object (e.g., if a city is inside a county then the city 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 topological_relationship must secondarily involve one topological_object.


description (O, I: ndt_comment)

A description of the transient association. Inherited from transient_association.


duration (O, I: ndt_time)

Defines the duration of the association expressed in any valid units of time. Inherited from transient_association.


caused_by (O, I: activity(cause_association))

Specifies the activity which establishes this association. Each topological_relationship may be caused by one activity. Inherited from transient_association.


data_collection (I, V: SET[0:?] data_collection(collection_content))

Indicates the data collections that include this instance of E and P data. Each topological_relationship may be a member of one or more data_collection. Inherited from e_and_p_data.


graphical_element (I, V: SET[0:?] graphical_element(depicted_object))

Specifies one or more graphical elements which are depicting this data item. Each topological_relationship may be depicted by one or more graphical_element. Inherited from e_and_p_data.


ref_transient_period (O, I: ref_transient_period) (1222)

The type of period over which the property applies, such as day, month, quarter, cumulative, etc. Inherited from transient_association.


terminated_by (O, I: activity(terminate_association))

Specifies the activity which established the termination of a transient association between two objects. Each topological_relationship may be terminated by one activity. Inherited from transient_association.

Local rules:

Uniqueness Constraint
boundary_overlap, end_time, ref_object_intersection, start_time, primary_topological_object, secondary_topological_object
[I: transient_association] Instance Value Constraint (1259)
If REF_TRANSIENT_PERIOD is EVENT, then both START_TIME and END_TIME must either be blank or be identical.
[I: transient_association] Instance Value Constraint
If REF_TRANSIENT_PERIOD is either YEAR TO DATE, MONTH TO DATE or CUMULATIVE, then END_TIME must be instantiated.
[I: transient_association] Instance Value Constraint
If REF_TRANSIENT_PERIOD is ANNUAL, SEMIANNUAL, QUARTER, MONTHLY, DAILY, or HOURLY, then either both START_TIME and END_TIME are blank or both must be instantiated.
Supertype path(s):
e_and_p_data > association > transient_association > topological_relationship.

Entity projects as table TOPOLOGICAL_REL.

Referenced in Diagrams:

• SM1: Spatial Model Topology Hierarchy