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We study the problem of eliminating recursion from monadic datalog programs on trees with labels taken from an infinite alphabet. We show that the boundedness problem, i.e., determining whether a datalog program is equivalent to some nonrecursive one is undecidable but the decidability is regained if the descendant relation is disallowed. Under similar restrictions we obtain decidability of the problem of equivalence to a given nonrecursive program. We investigate the connection between these two problems in more detail.

Eliminating Recursion from Monadic Datalog Programs on Trees