content: /*
   *  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.causeway.applib.annotation;
  
  import java.lang.annotation.ElementType;
  import java.lang.annotation.Inherited;
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  import java.lang.annotation.Target;
  
  /**
   * Annotation container, without any semantics.
   * @see Domain.Include
   * @see Domain.Exclude
   */
  @Target({
      ElementType.METHOD,
      ElementType.FIELD,
      ElementType.ANNOTATION_TYPE
  })
  @Retention(RetentionPolicy.RUNTIME)
  public @interface Domain {
  
      /**
       * Indicates that a field or method must contribute to the metamodel.
       * <p>
       * For <i>mixins</i> is also allowed to be placed on the mixin's main method.
       * <p>
       * By placing the {@link Domain.Include} annotation on a method or field,
       * a contract with the meta-model is enforced,
       * such that this class-member must be recognized by the meta-model
       * and cannot be ignored.
       * Meta-model validation will fail when this contract is violated.
       * <p>
       * Acts as the semantic counterpart to {@link Domain.Exclude}.
       * @see Domain.Exclude
       * @since 2.x {@index}
       */
      @Inherited
      @Target({
          ElementType.METHOD,
          ElementType.FIELD,
          ElementType.ANNOTATION_TYPE
      })
      @Retention(RetentionPolicy.RUNTIME)
      public @interface Include {
      }
  
      /**
       * Indicates that a field, method or type should be ignored by the meta-model
       * introspection.
       * <p>
       * Acts as the semantic counterpart to {@link Domain.Include}.
       * @see Domain.Include
       *
       * @since 2.x {@index}
       */
      @Inherited
      @Target({
          ElementType.METHOD,
          ElementType.FIELD,
          ElementType.TYPE,
      })
      @Retention(RetentionPolicy.RUNTIME)
      public @interface Exclude {
      }
  
  }
  