// Copyright 2011, 2012 The Apache Software Foundation
//
// Licensed 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.tapestry5.ioc.def;


/**
 * Starting in Tapestry 5.3, contributions could be optional.
 *
 * @since 5.3
 * @see org.apache.tapestry5.ioc.annotations.Optional
 */
public interface ContributionDef3 extends ContributionDef2
{
    /** Is this contribution optional, meaning it is not an error if the service to which the contribution is targetted
     * does not exist.
     */
    boolean isOptional();
}