Semantic Grammars
Semantic grammars encode semantic information into a syntactic grammar.
They use context free rewrite rules with non terminal semantic constituents.
Generally a semantic error occurs when the meaning of the knowledge is not
properly communicated. Semantic errors occur if the human expert misinterprets
the knowledge engineer’s question or answers inappropriately. The proper
constituents of semantic grammar are noun phrase (NP), verb phrase (VP), Noun
(N), Verb (V), Preposition phrase (PP), Adverb (ADV) and so on. One of the
successful applications of semantic grammar is the LIFER system (A database
query system). In the LIFER system, there are several rules to handle the
wh-queries such as:
What is the name of your country?
Which department of your country is must efficient?
Who guide them?
Where they are being guided?
These sentences are analyzed and words matched to the symbols contained
in the lexicon entries. Semantic grammars are suitable for use in systems with
restricted grammars since its power of computation is limited.
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