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Implements the behavior associated with the 'join' (Beta) node in a RETE network:
- Stores tokens in two memories
- Tokens in memories are checked for consistent bindings (unification) for variables in common *across* both
- Network 'trigger' is propagated downward
This reference implementation follows, quite closely, the algorithms presented in the PhD thesis (1995) of Robert Doorenbos:
Production Matching for Large Learning Systems (RETE/UL)
A N3 Triple is a working memory element (WME)
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