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With inspiration from other libraries

There is a newer version: 2.12.15

/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.util;

/**
 * AggregationType classifies how one object is contained within 
 * another object.
 * 
 * 
 * 
 * See also http://en.wikipedia.org/wiki/Class_diagram
 * and http://en.wikipedia.org/wiki/Object_composition
 * 
 * @author Ceki Gulcu
 */
public enum AggregationType {
    NOT_FOUND, AS_BASIC_PROPERTY, // Long, Integer, Double,..., java primitive, String,
                                  // Duration or FileSize
    AS_COMPLEX_PROPERTY, // a complex property, a.k.a. attribute, is any attribute
                         // not covered by basic attributes, i.e.
                         // object types defined by the user
    AS_BASIC_PROPERTY_COLLECTION, // a collection of basic attributes
    AS_COMPLEX_PROPERTY_COLLECTION; // a collection of complex attributes
}