IfcFlowDirectionEnum

Definition from IAI: This enumeration defines the flow direction at a connection point as either a Source, Sink, or both SourceAndSink:

- SOURCE: A source of flow (e.g., it flows out of the connection)
- SINK: A flow sink (e.g., it flows into the connection)
- SOURCEANDSINK: Both a source and sink (e.g., it flows both into and out of the connection simultaneously)
- NOTDEFINED: Undefined flow direction

> HISTORY: New enumeration in IFC R2.0

EXPRESS specification:

TYPE IfcFlowDirectionEnum = ENUMERATION OF
( | SOURCE, SINK, SOURCEANDSINK, NOTDEFINED);
END_TYPE;