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:
- 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 javax.xml.bind.package javadoc for additional common information.
- Since:
- JAXB2.0
- See Also:
-
XmlElement
,XmlElements
,XmlElementRef
,XmlElementRefs
Optional Elements
Modifier and Type | Optional Element and 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 |
boolean |
required Customize the wrapper element declaration to be required. |
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:
- If the enclosing package has
XmlSchema
annotation, and itselementFormDefault
isQUALIFIED
, then the namespace of the enclosing class. - 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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https://docs.oracle.com/javase/8/docs/api/javax/xml/bind/annotation/XmlElementWrapper.html