By contrast, in constraint-based syntactic theories, such as Lexical Functional Grammar (LFG), exocentric constructions are still widely used, but with a different role. Exocentricity is used in the treatment of non-configurational languages. As constraint-based models such as LFG do not represent a "deep structure" at which non-configurational languages can be treated as configurational, the exocentric S is used to formally represent the flat structure inherent in a non-configurational language. Hence, in a constraints-based analysis of Warlpiri, an exocentric structure follows the auxiliary, dominating all of the verb, arguments and adjuncts which are not raised to the specifier position of the IP: