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Many approaches have been pursued to implement constraint-based and/or feature-structure-based linguistic theories such as those discussed in this book. Those approaches include FUG (Kay 1985), PATR-II (Shieber 1986), and ALE (Carpenter 1992)1, among others. FUG and PATR-II, which were developed in the 1980s, mainly address unification of feature structures. ALE, developed in the early 1990s, does not just implement unification of feature structures but also addresses constraint-based computation on them. ALE is a constraint logic programming (CLP) language that treats typed feature structures as terms and processes constraints embedded in them.
KeywordsLexical Entry Horn Clause Head Noun Constraint Logic Programming Structural Principle
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