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

import java.security.spec.AlgorithmParameterSpec;
import javax.xml.crypto.dsig.spec.C14NMethodParameterSpec;

/**
 * A representation of the XML CanonicalizationMethod 
 * element as defined in the 
 * 
 * W3C Recommendation for XML-Signature Syntax and Processing. The XML 
 * Schema Definition is defined as:
 * 
 * 
 *   <element name="CanonicalizationMethod" type="ds:CanonicalizationMethodType"/>
 *     <complexType name="CanonicalizationMethodType" mixed="true">
 *       <sequence>
 *         <any namespace="##any" minOccurs="0" maxOccurs="unbounded"/>
 *           <!-- (0,unbounded) elements from (1,1) namespace -->
 *       </sequence>
 *       <attribute name="Algorithm" type="anyURI" use="required"/>
 *     </complexType>
 * 
 *
 * A CanonicalizationMethod instance may be created by invoking 
 * the {@link XMLSignatureFactory#newCanonicalizationMethod 
 * newCanonicalizationMethod} method of the {@link XMLSignatureFactory} class.
 *
 * @author Sean Mullan
 * @author JSR 105 Expert Group
 * @see XMLSignatureFactory#newCanonicalizationMethod(String, C14NMethodParameterSpec)
 */
public interface CanonicalizationMethod extends Transform {

    /**
     * The Canonical 
     * XML (without comments) canonicalization method algorithm URI.
     */
    final static String INCLUSIVE = 
        "http://www.w3.org/TR/2001/REC-xml-c14n-20010315";

    /**
     * The 
     * 
     * Canonical XML with comments canonicalization method algorithm URI.
     */
    final static String INCLUSIVE_WITH_COMMENTS =
        "http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments";

    /**
     * The Exclusive 
     * Canonical XML (without comments) canonicalization method algorithm
     * URI.
     */
    final static String EXCLUSIVE =
        "http://www.w3.org/2001/10/xml-exc-c14n#";

    /**
     * The 
     * Exclusive Canonical XML with comments canonicalization method 
     * algorithm URI.
     */
    final static String EXCLUSIVE_WITH_COMMENTS =
        "http://www.w3.org/2001/10/xml-exc-c14n#WithComments";

    /**
     * Returns the algorithm-specific input parameters associated with this 
     * CanonicalizationMethod.
     *
     * The returned parameters can be typecast to a 
     * {@link C14NMethodParameterSpec} object.
     *
     * @return the algorithm-specific input parameters (may be 
     *    null if not specified)
     */
    AlgorithmParameterSpec getParameterSpec();
}