Chapter 12. Engines

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	Building Parsers with Java By Steven  John  Metsker
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An engine is an object that powers query languages and logic languages. Engines accept queries and execute them by looking through a collection of data and rules. An engine returns objects or combinations of objects that match a query. This chapter introduces an engine that later chapters use to power a new logic language (Logikus) and a new query language (Jaql).

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