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package javax.xml.bind.annotation;

import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;

/**
 * <p>
 * Enables mapping a class to a  XML Schema complex type with a
 * simpleContent or a XML Schema simple type. 
 * </p>
 *
 * <p>
 * <b> Usage: </b>
 * <p>
 * The <tt>@XmlValue</tt> annotation can be used with the following program
 * elements: 
 * <ul> 
 *   <li> a JavaBean property.</li>
 *   <li> non static, non transient field.</li>
 * </ul>
 * 
 * <p>See "Package Specification" in javax.xml.bind.package javadoc for
 * additional common information.</p>
 *
 * The usage is subject to the following usage constraints:
 * <ul>
 *   <li>At most one field or property can be annotated with the
 *       <tt>@XmlValue</tt> annotation. </li> 
 *
 *   <li><tt>@XmlValue</tt> can be used with the following
 *   annotations: {@link XmlList}. However this is redundant since
 *   {@link XmlList} maps a type to a simple schema type that derives by
 *   list just as {@link XmlValue} would. </li>
 *
 *   <li>If the type of the field or property is a collection type,
 *       then the collection item type must map to a simple schema
 *       type.  </li>
 * 
 *   <li>If the type of the field or property is not a collection
 *       type, then the type must map to a XML Schema simple type. </li>
 *
 * </ul>
 * <p>
 * If the annotated JavaBean property is the sole class member being
 * mapped to XML Schema construct, then the class is mapped to a
 * simple type. 
 *
 * If there are additional JavaBean properties (other than the
 * JavaBean property annotated with <tt>@XmlValue</tt> annotation)
 * that are mapped to XML attributes, then the class is mapped to a
 * complex type with simpleContent.
 * </p>
 *
 * <p> <b> Example 1: </b> Map a class to XML Schema simpleType</p>
 *
 *   <pre>
 * 
 *     // Example 1: Code fragment
 *     public class USPrice {
 *         &#64;XmlValue
 *         public java.math.BigDecimal price;
 *     }
 *  
 *     &lt;!-- Example 1: XML Schema fragment --&gt;
 *     &lt;xs:simpleType name="USPrice"&gt;
 *       &lt;xs:restriction base="xs:decimal"/&gt;
 *     &lt;/xs:simpleType&gt;
 *
 *   </pre>
 * 
 * <p><b> Example 2: </b> Map a class to XML Schema complexType with
 *        with simpleContent.</p>
 * 
 *   <pre>
 *
 *   // Example 2: Code fragment
 *   public class InternationalPrice {
 *       &#64;XmlValue
 *       public java.math.BigDecimal price;
 * 
 *       &#64;XmlAttribute
 *       public String currency;
 *   }
 *  
 *   &lt;!-- Example 2: XML Schema fragment --&gt;
 *   &lt;xs:complexType name="InternationalPrice"&gt;
 *     &lt;xs:simpleContent&gt;
 *       &lt;xs:extension base="xs:decimal"&gt;
 *         &lt;xs:attribute name="currency" type="xs:string"/&gt;
 *       &lt;/xs:extension&gt;
 *     &lt;/xs:simpleContent&gt;
 *   &lt;/xs:complexType&gt;
 *
 *   </pre>
 *
 * @author Sekhar Vajjhala, Sun Microsystems, Inc.
 * @see XmlType
 * @since 1.6, JAXB 2.0
 */

@Retention(RUNTIME) @Target({FIELD, METHOD})
public @interface XmlValue {}
