TDL-A Type Description Language for Constraint-Based Grammars

This paper presents TDL, a typed feature-based representation language and inference system. Type definitions in TDL consist of type and feature constraints over the boolean counectives. TDL supports open-and closed-world reasoning over types and allows for partitions and incompatible types. Working with partially as well as with fully expanded types is possible. Efficient reasoning in TDL is accomplished through specialized modules.