In Jaworski and Przepiórkowski 2014 we propose to define 'semantic roles' on the basis of morphosyntactic information, including morphological cases, following the Slavic linguistic tradition stemming from the work of Roman Jakobson (see, e.g., Jakobson 1971a,b).
since the broader context of the work reported here is the development of a syntactico-semantic LFG (Lexical-Functional Grammar; Bresnan 2001; Dalrymple 2001) parser for Polish, we build on the usual LFG approach of obtaining semantic representations on the basis of f-structures, i.e., non-tree-configurational syntactic representations (as opposed to more surfacy tree-configurational c-structures) containing information about predicates, grammatical functions and morphosyntactic features; this so-called description-by-analysis (DBA) approach has been adopted for German (Frank and Erk, 2004;Frank and Semecký, 2004;Frank, 2004), English (Crouch and King, 2006) and Japanese (Umemoto, 2006).