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-Contains query nodes that are commonly used by query parser implementations
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-Query Nodes
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-The package org.apache.lucene.queryParser.nodes contains all the basic query nodes. The interface
-that represents a query node is {@link org.apache.lucene.queryParser.core.nodes.QueryNode}. Every query node must be serializable.
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-{@link org.apache.lucene.queryParser.core.nodes.QueryNode}s are used by the text parser to create a syntax tree.
-These nodes are designed to be used by UI or other text parsers.
-The default Lucene text parser is {@link org.apache.lucene.queryParser.standard.parser.StandardSyntaxParser},
-it implements Lucene's standard syntax.
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-{@link org.apache.lucene.queryParser.core.nodes.QueryNode} interface should be implemented by all query nodes,
-the class {@link org.apache.lucene.queryParser.core.nodes.QueryNodeImpl} implements {@link org.apache.lucene.queryParser.core.nodes.QueryNode} and is extended
-by all current query node implementations.
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-A query node tree can be printed to the a stream, and it generates a pseudo XML representation
-with all the nodes.
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-A query node tree can also generate a query string that can be parsed back by the original text parser,
-at this point only the standard lucene syntax is supported.
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-Grouping nodes:
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-- AndQueryNode - used for AND operator
-- AnyQueryNode - used for ANY operator
-- OrQueryNode - used for OR operator
-- BooleanQueryNode - used when no operator is specified
-- ModifierQueryNode - used for modifier operator
-- GroupQueryNode - used for parenthesis
-- BoostQueryNode - used for boost operator
-- SlopQueryNode - phrase slop
-- FuzzyQueryNode - fuzzy node
-- ParametricRangeQueryNode - used for parametric field:[low_value TO high_value]
-- ProximityQueryNode - used for proximity search
-- NumericRangeQueryNode - used for numeric range search
-- TokenizedPhraseQueryNode - used by tokenizers/lemmatizers/analyzers for phrases/autophrases
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-Leaf Nodes:
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-- FieldQueryNode - field/value node
-- NumericQueryNode - used for numeric search
-- PathQueryNode - {@link org.apache.lucene.queryParser.core.nodes.QueryNode} object used with path-like queries
-- OpaqueQueryNode - Used as for part of the query that can be parsed by other parsers. schema/value
-- ParametricQueryNode - used for parametric field [>=|<=|=|<|>] value
-- PrefixWildcardQueryNode - non-phrase wildcard query
-- QuotedFieldQUeryNode - regular phrase node
-- WildcardQueryNode - non-phrase wildcard query
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-Utility Nodes:
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-- DeletedQueryNode - used by processors on optimizations
-- MatchAllDocsQueryNode - used by processors on optimizations
-- MatchNoDocsQueryNode - used by processors on optimizations
-- NoTokenFoundQueryNode - used by tokenizers/lemmatizers/analyzers
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