Arc layers must contain the following attributes:
StartNodeId
Contains the GDBShapeId of the starting node.
EndNodeId
Contains the GDBShapeId of the ending node for this arc.
LeftAreaId
Contains the GDBShapeId of the left-area polygon or, if there is no such area, GDBNullShapeId.
RightAreaId
Contains the GDBShapeId of the right-area polygon or, if there is no such area, GDBNullShapeId.
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