Next: Head/Modifier frames
Up: The AGFL Grammar Work
Previous: Example: transduction
The ``English Phrases for IR" (EP4IR) grammar is a reasonably complete
grammar of English, concentrating on the description of the noun phrase
and the verb phrase. The grammar is provided with a large lexicon,
providing detailed Part-Of-Speech information. The grammar is
quite robust against incorrect input and unknown words.
The EP4IR grammar and lexicon were developed in the
[PEKING project] for Information Retrieval applications, and
they are released along with the AGFL system.
From the grammar and lexicon, an English parser can be generated
automatically using the AGFL system, which produces as its output not
parse trees but Head/Modifier frames, more or less as described above.
The following picture illustrates the generation of a parser and its
use.
Figure:
Generating and using a parser
|
The HM frame representation is a very good starting point for diverse
applications, and the transduction can be adapted with relative ease to
yet other applications.
The grammar still many details of the language, which will hopefully
seduce linguists to propose additions and improvements.
Kees Koster
2002-05-01