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Key/Rule/Unit not declared
Key w/o modifier: look up to root to check if it has been declared in direct ancestor units
Key w/ modifier: check if the sequence m1.m2...mn.key appears in the path from current unit up to the root unit
Rule w/o modifier: check declaration in the order of local units, objects, included units then included objects
Rule w/ modifier: check globally if the sequence m1.m2...mn.rule appears