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Apache Neethi provides general framework for the programmers to use WS Policy. It is compliant with latest WS Policy specification which was published in March 2006. This framework is specifically written to enable the Apache Web services stack to use WS Policy as a way of expressing it's requirements and capabilities.

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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.
 */

package org.apache.neethi;

/**
 * Assertions that need special consideration to implement
 * the intersection algorithms should implement this interface.
 * 
 * If an assertion does not implement this interface, the 
 * intersection algorithm will just check the qname of the
 * assertion as well as the contained policy if the assertion
 * implements the PolicyContainingAssertion interface.  This 
 * is adequate for most use cases and per spec, but this
 * interface allows an assertion to possibly consider special
 * attributes or other details to determine the behavior
 * for the intersection.
 */
public interface IntersectableAssertion extends Assertion {
    
    boolean isCompatible(Assertion assertion, boolean strict);
    
    Assertion intersect(Assertion assertion, boolean strict);
}