Abstract
Discontinuous grammars (DG)1 were devised by V. Dahl in 1981, as a generalization of extraposition grammars. They are basically metamorphosis grammars with the added flexibility that unidentified strings of constituents can be referred to (usually through a pseudo-symbol skip(X), where X stands for the skipped substring), to be repositioned, copied, or deleted at any position. They do not need to obey, as do XG’s, any nesting constraints.2
Originally, discontinuous grammars were called gapping grammars, but they were renamed because the term gap is used in linguistics with a different meaning than ours.
XG’s require that the two gaps be either totally independent or that one of them be completely included in the other.
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© 1989 Springer-Verlag New York Inc.
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Abramson, H., Dahl, V. (1989). Further Expressive Power—Discontinuous Grammars. In: Logic Grammars. Symbolic Computation. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-3640-5_11
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DOI: https://doi.org/10.1007/978-1-4612-3640-5_11
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