Case realization and identity

Languages with case concord sometimes require that at least one case-concor d element in the NP be inflected for case, while others may be uninflected. Focusing primarily on Serbo-Croatian, we review some variants of this case realization requirement in different languages and propose a unified accou nt. This analysis makes crucial use of reentrancy (cp. structure-sharing) i n attribute-value matrices, a key explanatory tool of Head-Driven Phrase St ructure Grammar. (C) 2001 Elsevier Science B.V. All rights reserved.