Yliopiston etusivulle In English
Helsingin yliopisto
clt361: Grammar Engineering - lukuvuosi 2009-2010


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Lexicalist Grammars and Semantics

  • Make a new subdirectory lkb-cfg-7 for this exercise. Copy all the files from ~gwilcock/delphin/lkb/src/data/itfs/g7sem into it. This grammar is very similar to g6morph but it also includes semantics.
  • Start LKB and load the grammar with the script file from your lkb-cfg-7 directory. Parse these dogs chased the cats.

The Type Hierarchy

  • View the type hierarchy in types.tdl. There are some differences from the type hierarchy in Syntactic Theory Chapter 8, but the basic ideas are the same.
  • The semantic features are collected under SEM as in Syntactic Theory, but here RESTR is called RELS (relations). There is an INDEX, but there is no MODE. RELS is implemented as a difference list.
  • The syntactic features HEAD, SPR and COMPS are not collected under SYN as in Syntactic Theory. Here they are all introduced on the type sign.

Grammar Rules

  • The type hierarchy in types.tdl again has three rule subtypes unary-rule, binary-rule, and ternary-rule. As before, they concatenate the daughters' ORTH strings to make the mother's ORTH string, but now they also concatenate the daughters' RELS lists to make the mother's RELS list. How?
  • Again there are two other rule subtypes head-initial and head-second (here called binary-head-second). As before, they implement the Head Feature Principle, but now they also implement the Semantic Inheritance Principle. How?
  • Which types implement the Semantic Compositionality Principle?
  • Because the Semantic Inheritance Principle and the Semantic Compositionality Principle are implemented in the type hierarchy, the grammar rules in rules.tdl are exactly the same as in g6morph. No change is needed for the semantics.
  • Now there is also an implementation of the Head-Modifier Rule.

Lexical Entries

  • View the lexical entries in lexicon.tdl. The entries are subtypes of lexeme. As well as ORTH, each entry specifies a semantic predicate PRED.
  • Add lexical entries for the noun lexemes bus and boss, and parse these dogs chased the bus and these dogs chased the boss.
  • Extend the lexicon by adding entries for an intransitive verb, a transitive verb, and a ditransitive verb. Parse some test sentences containing these verbs.
© 2006-2010 Graham Wilcock

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