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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: RetrievalMethod.java 1092655 2011-04-15 10:24:18Z coheigea $
 */
package javax.xml.crypto.dsig.keyinfo;

import javax.xml.crypto.Data;
import javax.xml.crypto.URIReference;
import javax.xml.crypto.URIReferenceException;
import javax.xml.crypto.XMLCryptoContext;
import javax.xml.crypto.XMLStructure;
import javax.xml.crypto.dsig.Transform;
import java.util.List;

/**
 * A representation of the XML RetrievalMethod element as 
 * defined in the 
 * W3C Recommendation for XML-Signature Syntax and Processing. 
 * A RetrievalMethod object is used to convey a reference to
 * KeyInfo information that is stored at another location.
 * The XML schema definition is defined as: 
 *
 *  *   <element name="RetrievalMethod" type="ds:RetrievalMethodType"/>
 *   <complexType name="RetrievalMethodType">
 *     <sequence>
 *       <element name="Transforms" type="ds:TransformsType" minOccurs="0"/> 
 *     </sequence>  
 *     <attribute name="URI" type="anyURI"/>
 *     <attribute name="Type" type="anyURI" use="optional"/>
 *   </complexType>
 * 
 *
 * A RetrievalMethod instance may be created by invoking one of the
 * {@link KeyInfoFactory#newRetrievalMethod newRetrievalMethod} methods 
 * of the {@link KeyInfoFactory} class, and passing it the URI 
 * identifying the location of the KeyInfo, an optional type URI identifying 
 * the type of KeyInfo, and an optional list of {@link Transform}s; for example:
 *  *   KeyInfoFactory factory = KeyInfoFactory.getInstance("DOM");
 *   RetrievalMethod rm = factory.newRetrievalMethod
 *      ("#KeyValue-1", KeyValue.DSA_TYPE, Collections.singletonList(Transform.BASE64));
 * 
 *
 * @author Sean Mullan
 * @author JSR 105 Expert Group
 * @see KeyInfoFactory#newRetrievalMethod(String)
 * @see KeyInfoFactory#newRetrievalMethod(String, String, List)
 */
public interface RetrievalMethod extends URIReference, XMLStructure {

    /**
     * Returns an {@link java.util.Collections#unmodifiableList unmodifiable 
     * list} of {@link Transform}s of this RetrievalMethod. 
     *
     * @return an unmodifiable list of Transform objects (may be 
     *    empty but never null). 
     */
    List getTransforms();

    /**
     * Returns the URI of the referenced KeyInfo information.
     *
     * @return the URI of the referenced KeyInfo information in 
     *    RFC 2396 format (never null)
     */
    String getURI();

   /**
    * Dereferences the KeyInfo information referenced by this 
    * RetrievalMethod and applies the specified 
    * Transforms.
    *
    * @param context an XMLCryptoContext that may contain 
    *    additional useful information for dereferencing the URI. The 
    *    context's baseURI and dereferencer 
    *    parameters (if specified) are used to resolve and dereference this
    *    RetrievalMethod
    * @return a Data object representing the raw contents of the
    *    KeyInfo information referenced by this 
    *    RetrievalMethod. It is the caller's responsibility to
    *    convert the returned data to an appropriate 
    *    KeyInfo object.
    * @throws NullPointerException if context is null
    * @throws URIReferenceException if there is an error while dereferencing
    */
    Data dereference(XMLCryptoContext context) throws URIReferenceException;
}