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The morphological, syntactic, and tree databases together comprise the
English grammar4.1. A lexical item that is not in the
databases receives a default tree selection and features for its part
of speech and morphology.
In designing the grammar, a decision was made early on to err on the
side of acceptance whenever there are conflicting opinions as to
whether or not a construction is grammatical. In this sense, the XTAG
English grammar is intended to function primarily as an acceptor
rather than a generator of English sentences. The range of syntactic
phenomena that can be handled is large and includes auxiliaries
(including inversion), copula, raising and small clause constructions,
topicalization, relative clauses, infinitives, gerunds, passives,
adjuncts, it-clefts, wh-clefts, PRO constructions, noun-noun
modifications, determiner sequences, genitives, negation, noun-verb
contractions, clausal adjuncts and imperatives.
This chapter is meant to be an introductory look at grammar
organization in XTAG. It serves as basic information the reader would
need to read the more detailed information about the grammar in
subsequent parts of the technical report.