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stream

A <stream> is a <physical_object> that is material or energy moving along a path, where the path is the basis of identity and may be constrained. The stream consists of the temporal parts of those things that are in the stream whilst they are in it.
EXAMPLE Flux is a 4D-constrained case of <stream> where the path crosses a surface.
EXAMPLE The naphtha flowing in a pipe between a crude distillation unit and a platformer is a <stream>.

EXPRESS specification:

ENTITY stream
SUBTYPE OF ( physical_object);
END_ENTITY;

References (1):

Name Type Referred through Express-G
physical_object Entity
Subtype
Diagram 6

Inheritance graph

ENTITY stream;
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;
ENTITY stream;
END_ENTITY;