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/*
 * Copyright (c) OSGi Alliance (2012, 2013). All Rights Reserved.
 * 
 * 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 org.osgi.framework.namespace;

import org.osgi.annotation.versioning.ProviderType;
import org.osgi.resource.Namespace;

/**
 * Wiring Capability and Requirement Namespaces base class.
 * 
 * 
 * This class is the common class shared by all OSGi defined wiring namespaces.
 * It defines the names for the common attributes and directives for the OSGi
 * specified wiring namespaces.
 * 
 * 
 * The values associated with these keys are of type {@code String}, unless
 * otherwise indicated.
 * 
 * @Immutable
 * @author $Id: 6bbd0ddefc452b0ace2f43ec3aa67a687adcf03c $
 */
@ProviderType
public abstract class AbstractWiringNamespace extends Namespace {

	/**
	 * The capability directive used to specify the comma separated list of
	 * mandatory attributes which must be specified in the
	 * {@link Namespace#REQUIREMENT_FILTER_DIRECTIVE filter} of a requirement in
	 * order for the capability to match the requirement.
	 */
	public final static String	CAPABILITY_MANDATORY_DIRECTIVE		= "mandatory";

	/**
	 * The capability attribute contains the {@code Version} of the resource
	 * providing the capability if one is specified or {@code 0.0.0} if not
	 * specified. The value of this attribute must be of type {@code Version}.
	 */
	public static final String	CAPABILITY_BUNDLE_VERSION_ATTRIBUTE	= "bundle-version";

	AbstractWiringNamespace() {
		// empty
	}
}