The project is built on the XLE platform, a complete parsing implementation of the LFG syntactic formalism which operates within Unix and Tcl/Tk. It includes various features integrated since the introduction of LFG theory by Kaplan and Bresnan (1982), such as functional uncertainty, functional precedence, generalization for coordination, multiple projections, and restriction. It has a very rich c-structure rule notation, as well as various kinds of abbreviatory devices (including parameterized templates, macros, and complex categories). The core of the project is an efficient unification-based parser based on ``contexted unification'' (Maxwell and Kaplan 1991) and a unification-based generator.
XLE includes:
The XLE documentation is freely available on-line. The XLE is available under license for research and commercial purposes; contact Tracy Holloway King for details.
From the inception of the project until 1995, we used the Xerox LFG Grammar Writer's Workbench, a grammar development environment written in Medley Lisp, a variant of Interlisp (Kaplan and Maxwell 1996). The Grammar Writer's Workbench is similar in spirit to the XLE and has comparable coverage of the LFG formalism.
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