LIFER/LADDER

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LIFER/LADDER was one of the first database natural language processing systems. It was designed as a natural language interface to a database of information about US Navy ships. This system, as described in a paper by Hendrix (1978), used a semantic grammar to parse questions and query a distributed database.

The LIFER/LADDER system could only support simple one-table queries or multiple table queries with easy join conditions.[1]

Some examples of queries it could accept:

  • What are the length, width, and draft of the Kitty Hawk?
  • When will Reeves achieve readiness rating C2?
  • What is the nearest ship to Naples with a doctor on board?
  • What ships are carrying cargo for the United States?
  • Where are they going?
  • Print the American cruisers’ current positions and states of readiness?

References[edit]

  1. ^ NATURAL LANGUAGE QUERY PROCESSING USING SEMANTIC GRAMMAR