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Necessary interfaces to implement text parsers.
Parser

The package org.apache.lucene.queryparser.flexible.parser contains interfaces
that should be implemented by the parsers.
Parsers produce QueryNode Trees from a string object.
These package still needs some work to add support to for multiple parsers.
Features that should be supported for the future, related with the parser:
- QueryNode tree should be able convertible to any parser syntax.
- The query syntax should support calling other parsers.
- QueryNode tree created by multiple parsers.
/** 
 * Necessary interfaces to implement text parsers.
 * 
 * <h2>Parser</h2>
 * <p>
 * The package <tt>org.apache.lucene.queryparser.flexible.parser</tt> contains interfaces
 * that should be implemented by the parsers.
 * 
 * Parsers produce QueryNode Trees from a string object.
 * These package still needs some work to add support to for multiple parsers.
 * 
 * Features that should be supported for the future, related with the parser:
 * - QueryNode tree should be able convertible to any parser syntax.
 * - The query syntax should support calling other parsers.
 * - QueryNode tree created by multiple parsers.
 */
package org.apache.lucene.queryparser.flexible.core.parser;