Overlay Mechanisms for Multi-level Deep Processing
Applications
Tracy Holloway King and John T. Maxwell III
Abstract
Deep grammars that include tokenization, morphology, syntax, and semantic
layers have obtained broad coverage in conjunction with high efficiency.
This allows them to play a crucial role in applications. However,
these grammars are often developed as a general purpose grammar, expecting
"standard" input, and have to be specialized for the application domain.
This paper discusses some engineering tools that are used in the XLE grammar
development platform to allow for domain specialization. It provides examples
of techniques used to allow specialization via overlay grammars at the
level of tokenization, morphology, syntax, the lexicon, and semantics. As an
example, the paper focuses on the use of the broad coverage, general purpose
ParGram English grammar and semantics in the context of an Intelligent Document
Security Solutions (IDSS) system. Within this system, the grammar is
used to automatically identify sensitive entities and relations among entities,
which can then be redacted to protect the content.
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