The model of topology that has been implemented is the traditional node-arc-area approach:

The following is tracked as attributes of the nodes, arcs, and areas within GDB.

A full topology consists of three vector layers (segments). These are: a node layer with the points of intersection of arcs, an arc layer with the lines defining boundaries between areas, and an area layer representing the polygon regions.

You must keep the three layers together or at least ensure that they can be found by using inter layer references, stored as metadata, on each layer in the topology grouping.

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