XmlElementWrapper (Jakarta EE Platform API)

```
@Retention(RUNTIME)
@Target({FIELD,METHOD})
public @interface XmlElementWrapper
```
Generates a wrapper element around XML representation. This is primarily intended to be used to produce a wrapper XML element around collections. The annotation therefore supports two forms of serialization shown below.
```
    //Example: code fragment
      int[] names;

    // XML Serialization Form 1 (Unwrapped collection)
    <names> ... </names>
    <names> ... </names>
 
    // XML Serialization Form 2 ( Wrapped collection )
    <wrapperElement>
       <names> value-of-item </names>
       <names> value-of-item </names>
       ....
    </wrapperElement>
 
```
The two serialized XML forms allow a null collection to be represented either by absence or presence of an element with a nillable attribute.
Usage

The @XmlElementWrapper annotation can be used with the following program elements:
- JavaBean property
- non static, non transient field
The usage is subject to the following constraints:
- The property must be a collection property
- This annotation can be used with the following annotations: XmlElement, XmlElements, XmlElementRef, XmlElementRefs, XmlJavaTypeAdapter.
See "Package Specification" in jakarta.xml.bind.package javadoc for additional common information.
Since:

1.6, JAXB 2.0

Author:
- Kohsuke Kawaguchi, Sun Microsystems, Inc.
- Sekhar Vajjhala, Sun Microsystems, Inc.
See Also:

XmlElement, XmlElements, XmlElementRef, XmlElementRefs

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element	Description
`String`	`name`	Name of the XML wrapper element.
`String`	`namespace`	XML target namespace of the XML wrapper element.
`boolean`	`nillable`	If true, the absence of the collection is represented by using `xsi:nil='true'`.
`boolean`	`required`	Customize the wrapper element declaration to be required.

- Element Detail
  - name
```
String name
```
    Name of the XML wrapper element. By default, the XML wrapper element name is derived from the JavaBean property name.
    
    Default:
    
    "##default"
- - namespace
```
String namespace
```
    XML target namespace of the XML wrapper element.
    If the value is "##default", then the namespace is determined as follows:
    
    If the enclosing package has XmlSchema annotation, and its elementFormDefault is QUALIFIED, then the namespace of the enclosing class.
    Otherwise "" (which produces unqualified element in the default namespace.
    Default:
    
    "##default"
- - nillable
```
boolean nillable
```
    If true, the absence of the collection is represented by using xsi:nil='true'. Otherwise, it is represented by the absence of the element.
    
    Default:
    
    false
- - required
```
boolean required
```
    Customize the wrapper element declaration to be required.
    If required() is true, then the corresponding generated XML schema element declaration will have minOccurs="1", to indicate that the wrapper element is always expected.
    Note that this only affects the schema generation, and not the unmarshalling or marshalling capability. This is simply a mechanism to let users express their application constraints better.
    
    Since:
    
    1.6, JAXB 2.1
    
    Default:
    
    false