javax.xml.bind.annotation

## Annotation Type XmlID

-     @Retention(value=RUNTIME)
       @Target(value={FIELD,METHOD})
      public @interface XmlID

  Maps a JavaBean property to XML ID.

  To preserve referential integrity of an object graph across XML serialization followed by a XML deserialization, requires an object reference to be marshalled by reference or containment appropriately. Annotations `@XmlID` and `@XmlIDREF` together allow a customized mapping of a JavaBean property's type by containment or reference.

  Usage

  The `@XmlID` annotation can be used with the following program elements:
  - a JavaBean property
  - non static, non transient field

  See "Package Specification" in javax.xml.bind.package javadoc for additional common information.

  The usage is subject to the following constraints:
  - At most one field or property in a class can be annotated with `@XmlID`.
  - The JavaBean property's type must be `java.lang.String`.
  - The only other mapping annotations that can be used with `@XmlID` are:`@XmlElement` and `@XmlAttribute`.

  Example: Map a JavaBean property's type to `xs:ID`

          // Example: code fragment
          public class Customer {
              @XmlAttribute
              @XmlID
              public String getCustomerID();
              public void setCustomerID(String id);
              .... other properties not shown
          }

          <!-- Example: XML Schema fragment -->
          <xs:complexType name="Customer">
            <xs:complexContent>
              <xs:sequence>
                ....
              </xs:sequence>
              <xs:attribute name="customerID" type="xs:ID"/>
            </xs:complexContent>
          </xs:complexType>

  Since:
    JAXB2.0
  See Also:
    `XmlIDREF`

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