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<Paper uid="P01-1018">
  <Title>Constraints on strong generative power</Title>
  <Section position="7" start_page="11" end_page="11" type="concl">
    <SectionTitle>
5 Discussion
</SectionTitle>
    <Paragraph position="0"> We have proposed a more constrained version of Joshi's question, &amp;quot;How much strong generative power can be squeezed out of a formal system without increasing its weak generative power,&amp;quot; and shown that within these constraints, a variant ofTAGcalled MMTAGcharacterizes thelimit of how much strong generative power can be squeezed out of CFG. Moreover, using the notion of a meta-level grammar, this result is extended to formalisms beyond CFG.</Paragraph>
    <Paragraph position="1"> It remains to be seen whether RF-MMTAG, whether used directly or for specifying meta-level grammars, provides further practical benefits on top of existing &amp;quot;squeezed&amp;quot; grammar formalisms like tree-local MCTAG, tree insertion grammar, or regular form TAG.</Paragraph>
    <Paragraph position="2"> This way of approaching Joshi's question is by no means the only way, but wehope that this work will contribute to a better understanding of the strong generative capacity of constrained grammar formalisms as well as reveal more powerful formalisms for linguistic analysis and natural language processing.</Paragraph>
  </Section>
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