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In this work we study anti-unification for unranked terms and hedges, permitting context and hedge variables. Hedges are sequences of unranked terms. The anti-unification problem of two hedges ~ s and ~ is concerned with finding their generalization, a hedge ~ such that both ~ and ~ are instances of ~ g under some substitutions. Context variables are used to abstract vertical dierences in the input hedges, and hedge variables are used to abstract horizontal dierences. A rule based system in Huet’s style will be presented, which computes a set of generalizations of input hedges and records all the dierences. The computed generalizations are least general among a certain class of generalizations.

Unranked Anti-Unification with Hedge and Context Variables