Extensible Dependency Grammar (XDG) is a new grammar framework based on dependency grammar.
In XDG, an expression of natural language is analyzed along an arbitrary number of semi-independent dimensions, e.g. syntactic function, word order, predicate-argument structure, scope, prosodic structure and information structure. Each of these dimensions is constrained by a set of independent well-formedness conditions (e.g. valency), placing intersective demands on the well-formedness conditions of the analysis as a whole. Additionally, cross-cutting constraints (e.g. linking) can be used to constrain the relation of several dimensions at a time.
XDG is a descendant of Topological Dependency Grammar (TDG).
The XDG Development Kit (XDK) offers a host of tools and amenities for grammar development.
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