/*
 * Copyright (c) 2003, 2004 IBM Corporation and others.
 * All rights reserved.   This program and the accompanying materials
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 *
 * Contributors:
 *   IBM - Initial API and implementation
 *
 * $Id: Extension.java,v 1.2 2004/04/10 04:09:50 khussey Exp $
 */
package org.eclipse.uml2;

import org.eclipse.emf.common.util.EList;

/**
 * <!-- begin-user-doc -->
 * A representation of the model object '<em><b>Extension</b></em>'.
 * <!-- end-user-doc -->
 *
 * <p>
 * The following features are supported:
 * <ul>
 *   <li>{@link org.eclipse.uml2.Extension#isRequired <em>Is Required</em>}</li>
 *   <li>{@link org.eclipse.uml2.Extension#getMetaclass <em>Metaclass</em>}</li>
 * </ul>
 * </p>
 *
 * @see org.eclipse.uml2.UML2Package#getExtension()
 * @model 
 * @generated
 */
public interface Extension extends Association{
	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	String copyright = "Copyright (c) 2003, 2004 IBM Corporation and others."; //$NON-NLS-1$

	/**
	 * Returns the value of the '<em><b>Is Required</b></em>' attribute.
	 * <!-- begin-user-doc -->
	 * <p>
	 * If the meaning of the '<em>Is Required</em>' attribute isn't clear,
	 * there really should be more of a description here...
	 * </p>
	 * <!-- end-user-doc -->
	 * @return the value of the '<em>Is Required</em>' attribute.
	 * @see org.eclipse.uml2.UML2Package#getExtension_IsRequired()
	 * @model dataType="org.eclipse.uml2.Boolean" transient="true" changeable="false" volatile="true" derived="true"
	 * @generated
	 */
	boolean isRequired();

	/**
	 * Returns the value of the '<em><b>Metaclass</b></em>' reference.
	 * It is bidirectional and its opposite is '{@link org.eclipse.uml2.Class#getExtensions <em>Extension</em>}'.
	 * <!-- begin-user-doc -->
	 * <p>
	 * If the meaning of the '<em>Metaclass</em>' reference isn't clear,
	 * there really should be more of a description here...
	 * </p>
	 * <!-- end-user-doc -->
	 * @return the value of the '<em>Metaclass</em>' reference.
	 * @see org.eclipse.uml2.UML2Package#getExtension_Metaclass()
	 * @see org.eclipse.uml2.Class#getExtensions
	 * @model opposite="extension" required="true" transient="true" changeable="false" volatile="true" derived="true"
	 * @generated
	 */
	org.eclipse.uml2.Class getMetaclass();

	/**
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @model parameters=""
	 * @generated
	 */
	EList getOwnedEnds();

} // Extension