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<Paper uid="P87-1027">
  <Title>The Derivation of a GrammaticaUy Indexed Lexicon from the Longman Dictionary of Contemporary English</Title>
  <Section position="3" start_page="193" end_page="193" type="intro">
    <SectionTitle>
2 The target lexicon
</SectionTitle>
    <Paragraph position="0"> Given the goal of the toolkit projects to provide a ledcon capable of supporting morphological and syntactic analysis of English, there is a precise definition of the information required in lexical entries. Both the grammar and morphology projects have adopted a feature system based largely on that described in Gasdar et al.</Paragraph>
    <Paragraph position="1"> (1985). A lexical entry will contain features relevant either to the word grammar or sentence grammar, or both, represented as a list of feature name / feature value pairs. In Figure I we show a fragment from the hand crafted lexicon developed as part of the morphology project (Russell et al., 1986). Here we concentrate on the feature-value sets carrying the syntactic information; the complete entries have also semantic and user fields, which are of no relevance to this paper.</Paragraph>
    <Paragraph position="2">  believe (V *. \]1 -, BAIL O, AG~ \[BAi 2, V -, If *.</Paragraph>
    <Paragraph position="3"> ~'01H NOel. PlO -. ~ -. V01O +, AUI -, ISFL +, FI\] -. VFORN BSE, TAT -. SUBCAT OK\] \[V /, ~ -, BaIL O. AGIt \[BAR 2. V -. lJ *, l~'01Lq !\[01)4\], PID -, gF.A -, VOBD % AUX -, ISFL % FI! -, VFORM BSZ, IAT -, SUBCAT I'10NP\] IV*. I -. B~ O. A~I. \[BkR 2. V -. I /.</Paragraph>
    <Paragraph position="4"> NFO~ NoEq\]. PRD-, ~-, woRD % AUX-, I\]nq, % FIN -. VFOEq BSE. IAT -. SUBCAT IP..AP\] \[V /, N -, BA.i O. AGR \[BE~. 2, V -. N /.</Paragraph>
    <Paragraph position="5"> NFOR/4 N0a.q\]. FBD -. ~ -. V0RD +. AUX -.</Paragraph>
    <Paragraph position="6"> I~FL 4. FI~ -. YFOIH BSE. rat -. SO'CAT SFI\]J\]  An almost complete list of the feature names and potential values which may occur as part of the lexical entry for a given morpheme is given in Figure 2 overleaf. Grover et al. (1987) contains a complete description of the features used in the sentence grzmmar; P,.itchie et ~l. (1987) offers an equally complete description of the morphological and syntactic features relevant to the operations of the word grammar. For the purposes of this paper, we present a brief overview of the sentence grammar feature system.</Paragraph>
    <Paragraph position="7"> With exception of the features N, V and BAR, used to define the major categories of the grammar, most features can be classlfied in terms of the categories they apply to. For each major category type there is a set of head features which must appear on all instances of that category type, regardless of their BAR feature value. Further features must (or may) be associated only with some instances of a category type, depending on the value of their BAR feature (or, on occasions, some other feature). The sets of head features for the four major categories axe:</Paragraph>
  </Section>
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