If you have A -> B -> A, what do you expect your table to look like? I don't think that using sequential IDs will work that well ...
a_id | b_id
b_id | a_id
Each table has its own pool of sequential IDs, like most databases.
If, however, you are using three tables (One for nodes, one for linktypes, and one for node/node/link), then this is trivial:
Nope, it's not that simple. Each node type has its own table structure and most of them are more complicated than that.
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