4. The method of claim 3 , wherein, for each primitive of the first plurality of primitives added to the concentric graph database before any of the second plurality of primitives, the respective second unique identifier associated with the primitive is equivalent to the respective first unique identifier associated with the primitive.
3. The method of claim 1 , wherein, for each of the first plurality of primitives, the concentric graph database includes a respective mapping from a second unique identifier for the primitive to a first unique identifier associated with the primitive.