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/usr/include/xmltooling/signature/ContentReference.h is in libxmltooling-dev 1.6.4-1ubuntu2.

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/**
 * Licensed to the University Corporation for Advanced Internet
 * Development, Inc. (UCAID) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for
 * additional information regarding copyright ownership.
 *
 * UCAID 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.
 */

/**
 * @file xmltooling/signature/ContentReference.h
 * 
 * Interface for creating signature references.
 */

#if !defined(__xmltooling_sigref_h__) && !defined(XMLTOOLING_NO_XMLSEC)
#define __xmltooling_sigref_h__

#include <xmltooling/base.h>

class DSIGSignature;

namespace xmlsignature {
    /**
     * Interface for creating signature references based on application requirements.
     */
    class XMLTOOL_API ContentReference
    {
        MAKE_NONCOPYABLE(ContentReference);
    public:
        virtual ~ContentReference();

        /**
         * Given a native signature, asks the object to create the reference(s).
         * 
         * @param sig   native signature interface
         */
        virtual void createReferences(DSIGSignature* sig)=0;
        
    protected:
        /** Default constructor. */
        ContentReference();
    };
};

#endif /* __xmltooling_sigref_h__ */