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Provides a Java Domain Specific Language for building type-safe and refactoring proof JPA queries.

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/*
 * Copyright (C) 2008-2009 the original author or authors
 * 
 * Licensed 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.
 */
package com.google.code.liquidform;

/**
 * Marker interface for clauses that are acceptable as subqueries. Not all query
 * parts can make up a subquery (ORDER BY is not valid)).
 * 
 * @param 
 *            the type that is being returned by the SELECT clause.
 *            Useful for type-checking eg. in
 *            {@link LiquidForm#in(Object, SubQuery) IN construct}
 */
public interface SubQuery {

}