Structure-changing rule is a rule which changes already specified information, and renders the output form distinct from the input.
The feature [voice] is distinctive within the class of obstruents, but non-distinctive in the class of sonorants. If there is a rule which devoices obstruents in a particular environment, say word final, this rule will be structure-changing if it changes [-son, +voice] into [-son, -voice].
- Archangeli, D. 1984. Underspecification in Yawelmani Phonology and Morphology, doct. diss, MIT.
- Kiparsky, P. 1982. From Cyclic Phonology to Lexical Phonology, in: Hulst, H. van der and N. Smith (eds.) The Structure of Phonological Representations (I), pp.131-175
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