  We present a constraint-based case frame lexicon architecture for
bi-directional mapping between a syntactic case frame and a semantic frame. The
lexicon uses a semantic sense as the basic unit and employs a multi-tiered
constraint structure for the resolution of syntactic information into the
appropriate senses and/or idiomatic usage. Valency changing transformations
such as morphologically marked passivized or causativized forms are handled via
lexical rules that manipulate case frames templates. The system has been
implemented in a typed-feature system and applied to Turkish.
