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physical_object

A <physical_object> is a <possible_individual> that is a distribution of matter, energy, or both.
EXAMPLE 1 A piece of metal is a <physical_object>.
EXAMPLE 2 A tree is a <physical_object>
EXAMPLE 3 The thing identified by tag P101 is a <physical_object>.
EXAMPLE 4 A light beam is a <physical_object>.
EXAMPLE 5 A tank that is built and dismantled on site is both a <materialized_physical_object> and a <functional_physical_object>.

EXPRESS specification:

ENTITY physical_object
SUBTYPE OF ( possible_individual);
END_ENTITY;

References (5):

Name Type Referred through Express-G
functional_physical_object Entity
Supertype
Diagram 6
materialized_physical_object Entity
Supertype
Diagram 6
possible_individual Entity
Subtype
Diagram 6
spatial_location Entity
Supertype
Diagram 6
stream Entity
Supertype
Diagram 6

Inheritance graph

ENTITY physical_object;
ENTITY thing;
id  :  STRING;
record_copy_created  :  OPTIONAL representation_of_Gregorian_date_and_UTC_time;
record_created  :  OPTIONAL representation_of_Gregorian_date_and_UTC_time;
record_creator  :  OPTIONAL possible_individual;
record_logically_deleted  :  OPTIONAL representation_of_Gregorian_date_and_UTC_time;
why_deleted  :  OPTIONAL class_of_information_representation;
ENTITY possible_individual;
ENTITY physical_object;
END_ENTITY;