XmlNullPolicy (EclipseLink 2.7.15, API Reference)

```
@Target({FIELD,METHOD,TYPE,PACKAGE})
@Retention(RUNTIME)
public @interface XmlNullPolicy
```
Purpose: Provide a means of using annotations to customise the handling of null values and their xml representation.
This annotation provides the user with a mechanism to customise the way that EclipseLink handles the reading and writing of null values. The following values can be specified:
- xsiNilRepresentsNull - This indicates that during unmarshal, an element with an xsi:nil="true" attribute specified should be unmarshaled as "null" into the object.
- emptyNodeRepresentsNull - This indicates that during unmarshal, an empty node "<element/>" should be unmarshalled to as null in the object model.
- isSetPerformedForAbsentNode - If this is set to true, then for each mapped element that was absent from the document during unmarshal, the property in java will be explicitly set to null.
- nullRepresentationForXml - Determines how a null value in the object model is written out to XML.
See Also:

XmlNullPolicy, XmlMarshalNullRepresentation

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element	Description
`boolean`	`emptyNodeRepresentsNull`
`boolean`	`isSetPerformedForAbsentNode`
`XmlMarshalNullRepresentation`	`nullRepresentationForXml`
`boolean`	`xsiNilRepresentsNull`

- Element Detail
  - xsiNilRepresentsNull
```
boolean xsiNilRepresentsNull
```
    Default:
    
    false
- - emptyNodeRepresentsNull
```
boolean emptyNodeRepresentsNull
```
    Default:
    
    false
- - isSetPerformedForAbsentNode
```
boolean isSetPerformedForAbsentNode
```
    Default:
    
    true
- - nullRepresentationForXml
```
XmlMarshalNullRepresentation nullRepresentationForXml
```
    Default:
    
    org.eclipse.persistence.oxm.annotations.XmlMarshalNullRepresentation.ABSENT_NODE