Node layers must contain the following attribute:
ArcIdList
(GDBFieldTypeCountedInt) List of arc ShapeIds starting or ending at this node.
Each node should also have one vertex defining the position of the node. A node layer must have ARC_REF and AREA_REF metadata pointing to the related arc and area layers. It must also have a LAYER_TYPE of TOPO_NODES indicator in metadata.
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