... A Descriptive Characterization of Tree-Adjoining Languages (Project Note) James Rogers Dept. of Computer Science Univ. of Central Florida, Orlando, FL, USA ... et al., 1997). The scope of each of these applications is limited, to some extent, by the fact that there are no such descriptive characterizations of classes of languages beyond the context-free. ... and only the sets of strings forming the yield of sets of finite trees definable in the weak monadic second-order theory of multiple succes- sors (wSnS). These descriptive characterizations...