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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

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/**
 * 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.
 */
/*
 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
 */
/*
 * $Id: SignatureProperties.java 1092655 2011-04-15 10:24:18Z coheigea $
 */
package javax.xml.crypto.dsig;

import javax.xml.crypto.XMLStructure;
import java.util.List;

/**
 * A representation of the XML SignatureProperties element as 
 * defined in the 
 * W3C Recommendation for XML-Signature Syntax and Processing. 
 * The XML Schema Definition is defined as:
 * 
 *<element name="SignatureProperties" type="ds:SignaturePropertiesType"/> 
 *   <complexType name="SignaturePropertiesType">
 *     <sequence>
 *       <element ref="ds:SignatureProperty" maxOccurs="unbounded"/> 
 *     </sequence>
 *     <attribute name="Id" type="ID" use="optional"/> 
 *   </complexType>
 * 
 *
 * A SignatureProperties instance may be created by invoking the
 * {@link XMLSignatureFactory#newSignatureProperties newSignatureProperties} 
 * method of the {@link XMLSignatureFactory} class; for example: 
 *
 *  *   XMLSignatureFactory factory = XMLSignatureFactory.getInstance("DOM");
 *   SignatureProperties properties = 
 *	factory.newSignatureProperties(props, "signature-properties-1");
 * 
 *
 * @author Sean Mullan
 * @author JSR 105 Expert Group
 * @see XMLSignatureFactory#newSignatureProperties(List, String)
 * @see SignatureProperty
 */
public interface SignatureProperties extends XMLStructure {

    /**
     * URI that identifies the SignatureProperties element (this 
     * can be specified as the value of the type parameter of the 
     * {@link Reference} class to identify the referent's type).
     */
    final static String TYPE =
        "http://www.w3.org/2000/09/xmldsig#SignatureProperties";

    /**
     * Returns the Id of this SignatureProperties.
     *
     * @return the Id of this SignatureProperties (or 
     *    null if not specified)
     */
    String getId();
    
    /**
     * Returns an {@link java.util.Collections#unmodifiableList unmodifiable 
     * list} of one or more {@link SignatureProperty}s that are contained in 
     * this SignatureProperties. 
     *
     * @return an unmodifiable list of one or more 
     *    SignaturePropertys 
     */
    List getProperties();
}