In addition, in the semantics domain, the use of a new TAG operation, flexible composition, is used to perform certain semantic operations that seemingly cannot be modeled with TL-MCTAG alone<cite> (Chiang and Scheffler, 2008)</cite> and in work in synchronous TAG semantics, constructions such as nested quantifiers require a set-local MCTAG (SL-MCTAG) analysis (Nesson and Shieber, 2006) .