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">
  <xs:restriction base="xs:string">
   <xs:enumeration value="source"/>
   <xs:enumeration value="sink"/>
   <xs:enumeration value="sourceandsink"/>
   <xs:enumeration value="notdefined"/>

EXPRESS Specification:

TYPE IfcFlowDirectionEnum = ENUMERATION OF (

Link to EXPRESS-G diagram EXPRESS-G diagram

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