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<Paper uid="C88-2158">
  <Title>Object-Oriented Parallel Parsing for Context-Free Grammars</Title>
  <Section position="3" start_page="0" end_page="0" type="intro">
    <SectionTitle>
1 Introduction
</SectionTitle>
    <Paragraph position="0"> This paper prcsents a new approach to parsing for context-free grammars, which is Conceptually very simple. The significance of our approach is supported by recent trends in computer-related fields. In computational linguistics, much attention has been drawn to parsing of context-free grammars owing to the progress of context-free based grammatical frameworks for natural languages such as LFG /Kaplan82/, GPSG /Gazdar85/. Furthermore, many practical natural language interface systems are based on context-free (phrase structure) grammars.</Paragraph>
    <Paragraph position="1"> In computer architecture and programming, exploitation of parallelism has be actively pursued; innovative computer architectures utilizing a large number of processors /Gottlieb83/ /Seitz85/ have been developed and accordingly new methodologies for concurrent l)rogramming /AghaS6//GelernterS6//Yonezawa87/ha.re been actively studied.</Paragraph>
    <Paragraph position="2"> In our basic parsing scheme, a given set of context-free grammar rules is viewed as a network of terminal and non-terminal symbols, and a corresponding network of processor-like computing agents with internal memory (or simple processors) is constructed. The node set of the network has a direct one-to-one correspondence to the set of occurrences of symbols appearing in the grammar rules and the link topology of the network is directly derived from the structure of the set of grammar rules. Our parsing scheme produces all the possible parse trees for a given input string without duplication.</Paragraph>
    <Paragraph position="3"> Since the notion of objects in object-oriented concurrent programming /Yonezawa87/ naturally fits the computing agents composing the network, this parsing scheme has been implemented in an object-oriented language for condeg current programming ABCI,/1/Yonezawa86/by representing each computing agent in the network as an object of ABCL/L</Paragraph>
  </Section>
class="xml-element"></Paper>