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<Paper uid="C92-3129">
  <Title>THE IPS SYSTEM</Title>
  <Section position="3" start_page="0" end_page="0" type="intro">
    <SectionTitle>
2 Architecture
</SectionTitle>
    <Paragraph position="0"> The IPS parser tries to associate with an input sentence a set of syntactic structures. These structures correspond to GB S-structures, i.e.</Paragraph>
    <Paragraph position="1"> surface structures enriched with traces of moved elements and other empty categories. In our implementation, GB grammatical modules correspond to particular processes. While some of the modules function as generators (2, chain modules, coordination module) in the sense that they increase the set of structures hypothesized at a given point, others are used as filters (Case module, 0-module) in the sense that their action tends to reduce the set of structures. The modules apply as soon as possible at each step in the parsing process, triggered by particular data or by specific calls from other modules.</Paragraph>
    <Paragraph position="2"> Alternatives are considered concurrently (pseudo-parallelism), and a small number of heuristics are used to restrict the size of the hypothesis set. To give an example, one heuristic gives precedence to attachments satisfying forreal selectional features over (cf. (3), (7)) other kinds of attachments. Thus, if an incoming verb form can be attached either as a complement to an auxiliary or as a main verb, preference will be given to the former a.</Paragraph>
    <Paragraph position="3"> User interaction -wtfich is an optional feature in the IPS system- can be used to select alternatives, mostly in case of attachment ambiguities, but occasionally also for other types of ambiguity (lexical, thematic, ere). Alternatives are then displayed (in an abbreviated manner) and the user is asked to make a selection.</Paragraph>
    <Paragraph position="4"> aNotice that this heuristic might explain garden path sentences such as &amp;quot;l'invitd quail a dit des folies&amp;quot; (the gueJt he has told inzanitiez),in which readers wrongly interpret dit as past participle selected by the auxiliary verb a.</Paragraph>
  </Section>
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