This enumeration defines the flow direction at a distribution port.
For pipe-based ports, the direction is the physical flow direction.
For duct-based ports, the direction is the physical flow direction.
For cable-based ports carrying electric power (circuits containing hot, neutral, ground), the direction is from the origination of power (from a distribution board to protective devices to switches to fixtures). For cable-based ports carrying communication signals, the direction originates from where the signal is shaped, such as a sensor. For communicaton networks, the direction originates from the up-level network host, such as a router (having SOURCE ports) hosting multiple computers (having SINK ports).
HISTORY New enumeration in IFC2.0.
Enumerated Item Definitions:
XSD Specification:<xs:simpleType name="IfcFlowDirectionEnum">
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