content: /*
   * Version.java July 2008
   *
   * Copyright (C) 2008, Niall Gallagher <niallg@users.sf.net>
   *
   * 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 com.aliyun.odps.simpleframework.xml;
  
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  
  /**
   * The <code>Version</code> annotation is used to specify an attribute
   * that is used to represent a revision of the class XML schema. This
   * annotation can annotate only floating point types such as double, 
   * float, and the java primitive object types. This can not be used to
   * annotate strings, enumerations or other primitive types.
   * 
   * @author Niall Gallagher
   */
  @Retention(RetentionPolicy.RUNTIME)
  public @interface Version {
     
     /**
      * This represents the name of the XML attribute. Annotated fields
      * or methods can optionally provide the name of the XML attribute
      * they represent. If a name is not provided then the field or 
      * method name is used in its place. A name can be specified if 
      * the field or method name is not suitable for the XML attribute.
      * 
      * @return the name of the XML attribute this represents
      */
     String name() default "";
  
     /**
      * This represents the revision of the class. A revision is used
      * by the deserialization process to determine how to match the
      * annotated fields and methods to the XML elements and attributes.
      * If the version deserialized is different to the annotated 
      * revision then annotated fields and methods are not required 
      * and if there are excessive XML nodes they are ignored.
      * 
      * @return this returns the version of the XML class schema
      */
     double revision() default 1.0;
     
     /**
      * Determines whether the version is required within an XML
      * element. Any field marked as not required will not have its
      * value set when the object is deserialized. This is written
      * only if the version is not the same as the default version.
      * 
      * @return true if the version is required, false otherwise
      */
     boolean required() default false;
  }
  