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Annotation Type XmlElementWrapper

@Retention(value=RUNTIME)
 @Target(value={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:

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

Since:
JAXB2.0
See Also:
XmlElement, XmlElements, XmlElementRef, XmlElementRefs

Elements

name

public abstract 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

public abstract String namespace

XML target namespace of the XML wrapper element.

If the value is "##default", then the namespace is determined as follows:

  1. If the enclosing package has XmlSchema annotation, and its elementFormDefault is QUALIFIED, then the namespace of the enclosing class.
  2. Otherwise "" (which produces unqualified element in the default namespace.
Default:
"##default"

nillable

public abstract 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

public abstract 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:
JAXB 2.1
Default:
false

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