* <p>Interface annotations are checked only on the exact interface
 * that defines the management interface of a Standard MBean or an
 * MXBean, not on its parent interfaces.  Method annotations are
 * checked only in the most specific interface in which the method
 * appears; in other words, if a child interface overrides a method
 * from a parent interface, only {@code @DescriptorKey} annotations in
 * the method in the child interface are considered.
 *
 * <p>The Descriptor fields contributed in this way by different
 * annotations on the same program element must be consistent.  That
 * is, two different annotations, or two members of the same
 * annotation, must not define a different value for the same
 * Descriptor field.  Fields from annotations on a getter method must
 * also be consistent with fields from annotations on the
 * corresponding setter method.</p>
 *
 * <p>The Descriptor resulting from these annotations will be merged
 * with any Descriptor fields provided by the implementation, such as
 * the <a href="Descriptor.html#immutableInfo">{@code
 * immutableInfo}</a> field for an MBean.  The fields from the annotations
 * must be consistent with these fields provided by the implementation.</p>
 *
 * <p>An annotation element to be converted into a descriptor field
 * can be of any type allowed by the Java language, except an annotation
 * or an array of annotations.  The value of the field is derived from
 * the value of the annotation element as follows:</p>
 *
 * <table border="2">
 * <tr><th>Annotation element</th><th>Descriptor field</th></tr>
 * <tr><td>Primitive value ({@code 5}, {@code false}, etc)</td>
 *     <td>Wrapped value ({@code Integer.valueOf(5)},
 *         {@code Boolean.FALSE}, etc)</td></tr>
 * <tr><td>Class constant (e.g. {@code Thread.class})</td>
 *     <td>Class name from {@link Class#getName()}
 *         (e.g. {@code "java.lang.Thread"})</td></tr>
 * <tr><td>Enum constant (e.g. {@link ElementType#FIELD})</td>
 *     <td>Constant name from {@link Enum#name()}
 *         (e.g. {@code "FIELD"})</td></tr>
 * <tr><td>Array of class constants or enum constants</td>
 *     <td>String array derived by applying these rules to each
 *         element</td></tr>
 * <tr><td>Value of any other type<br>
 *         ({@code String}, {@code String[]}, {@code int[]}, etc)</td>
 *     <td>The same value</td></tr>
 * </table>
 *
 * @since 1.6
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface DescriptorKey {
    String value();
}