/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
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Expressions.
 Expression - result of compiling an expression, which can evaluate it for a given document. Each expression can have external variables are resolved by Bindings. 
 Bindings - abstraction for binding external variables to a way to get a value for those variables for a particular document (DoubleValuesSource). 
 SimpleBindings - default implementation of bindings which provide easy ways to bind sort fields and other expressions to external variables 
/**
 * Expressions.
 * <p>
 * {@link org.apache.lucene.expressions.Expression} - result of compiling an expression, which can
 * evaluate it for a given document.  Each expression can have external variables are resolved by
 * {@code Bindings}.
 * </p>
 * 
 * <p>
 * {@link org.apache.lucene.expressions.Bindings} - abstraction for binding external variables
 * to a way to get a value for those variables for a particular document (DoubleValuesSource).
 * </p>
 * 
 * <p>
 * {@link org.apache.lucene.expressions.SimpleBindings} - default implementation of bindings which
 * provide easy ways to bind sort fields and other expressions to external variables
 * </p>
 */
package org.apache.lucene.expressions;