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Java Enterprise Edition (EE)


Annotation Type XmlElementDecl

public @interface XmlElementDecl

Maps a factory method to a XML element.


The annotation creates a mapping between an XML schema element declaration and a element factory method that returns a JAXBElement instance representing the element declaration. Typically, the element factory method is generated (and annotated) from a schema into the ObjectFactory class in a Java package that represents the binding of the element declaration's target namespace. Thus, while the annotation syntax allows @XmlElementDecl to be used on any method, semantically its use is restricted to annotation of element factory method. The usage is subject to the following constraints:
  • The class containing the element factory method annotated with @XmlElementDecl must be marked with XmlRegistry.
  • The element factory method must take one parameter assignable to Object.

Example 1: Annotation on a factory method

     // Example: code fragment
     class ObjectFactory {
         JAXBElement<String> createFoo(String s) { ... }

     // Example: code fragment corresponding to XML input
     JAXBElement<string> o =
     // print JAXBElement instance to show values
     System.out.println(o.getName());   // prints  "{}foo"
     System.out.println(o.getValue());  // prints  "string"
     System.out.println(o.getValue().getClass()); // prints "java.lang.String"

     <xs:element name="foo" type="xs:string" />

Example 2: Element declaration with non local scope

The following example illustrates the use of scope annotation parameter in binding of element declaration in schema derived code.

The following example may be replaced in a future revision of this javadoc.

       <xs:complextype name="pea">
         <xs:choice maxoccurs="unbounded">
           <xs:element name="foo" type="xs:string" />
           <xs:element name="bar" type="xs:string" />
       <xs:element name="foo" type="xs:int" />
     // Example: expected default binding
     class Pea {
         List<JAXBElement<String>> fooOrBar;
     class ObjectFactory {
         JAXBElement createPeaFoo(String s);
         JAXBElement createPeaBar(String s);
         JAXBElement createFoo(Integer i);
Without scope createFoo and createPeaFoo would become ambiguous since both of them map to a XML schema element with the same local name "foo".

JAXB 2.0
See Also:

Required Element Summary
 java.lang.String name
          local name of the XML element.
Optional Element Summary
 java.lang.String defaultValue
          Default value of this element.
 java.lang.String namespace
          namespace name of the XML element.
 java.lang.Class scope
          scope of the mapping.
 java.lang.String substitutionHeadName
          XML local name of a substitution group's head element.
 java.lang.String substitutionHeadNamespace
          namespace name of a substitution group's head XML element.

Element Detail


public abstract java.lang.String name
local name of the XML element.

Note to reviewers: There is no default name; since the annotation is on a factory method, it is not clear that the method name can be derived from the factory method name.

See Also:


public abstract java.lang.Class scope
scope of the mapping.

If this is not XmlElementDecl.GLOBAL, then this element declaration mapping is only active within the specified class.



public abstract java.lang.String namespace
namespace name of the XML element.

If the value is "##default", then the value is the namespace name for the package of the class containing this factory method.

See Also:


public abstract java.lang.String substitutionHeadNamespace
namespace name of a substitution group's head XML element.

This specifies the namespace name of the XML element whose local name is specified by substitutionHeadName().

If susbtitutionHeadName() is "", then this value can only be "##default". But the value is ignored since since this element is not part of susbtitution group when the value of susbstitutionHeadName() is "".

If susbtitutionHeadName() is not "" and the value is "##default", then the namespace name is the namespace name to which the package of the containing class, marked with XmlRegistry, is mapped.

If susbtitutionHeadName() is not "" and the value is not "##default", then the value is the namespace name.

See Also:


public abstract java.lang.String substitutionHeadName
XML local name of a substitution group's head element.

If the value is "", then this element is not part of any substitution group.

See Also:


public abstract java.lang.String defaultValue
Default value of this element.

The '' value specified as a default of this annotation element is used as a poor-man's substitute for null to allow implementations to recognize the 'no default value' state.



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