Revision as of 15:14, 14 January 2011

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Key API

• XmlSchema

Setting Up Namespace Information

Most XML documents are qualified with a namespace. You can namespace-qualify elements of your Java class at the following levels:

• Package
• Type
• Field / Property

In most cases, package-level annotation is sufficient. You can use the other levels to customize your document. Use the the @XmlSchema annotation to specify the namespace.

Package Level

Use the @XmlSchema annotation on the package to set a default namespace and specify that all elements in the package are qualified with the namespace. This information is specified in a special Java source file, package-info.java.

@XmlSchema(
   namespace="http://www.example.org/package",
   elementFormDefault=XmlNsForm.QUALIFIED)
package example;
 
import javax.xml.bind.annotation.XmlNsForm;
import javax.xml.bind.annotation.XmlSchema;

Using a simple Customer class, this will produce the following XML:

<customer xmlns="http://www.example.org/package">
   <name>Jane Doe</name>
   <account>36328721</account>
</customer>

All elements are qualified with the "http://www.example.org/package" namespace.

Type Level

Type level annotations will override the package level namespace.

@XmlRootElement
@XmlType(namespace="http://www.example.org/type")
public class Customer {
   private String name;
 
   private String account;
 
   ...
}

This will produce the following XML:

<ns2:customer xmlns="http://www.example.org/type" xmlns:ns2="http://www.example.org/package">
    <name>Jane Doe</name>
    <account>36328721</account>
</ns2:customer>

Only elements inside the Customer type are qualified with the "http://www.example.org/type" namespace.

Field/Property Level

You can override the package or type namespaces at the property/field level. All attribute and element annotations accept the namespace parameter.

@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(namespace="http://www.example.org/type")
public class Customer {
   private String name;
 
   @XmlElement(namespace="http://www.example.org/property")
   private String account;
 
   ...
}

This will produce the following XML:

<ns3:customer xmlns="http://www.example.org/type" xmlns:ns2="http://www.example.org/property" xmlns:ns3="http://www.example.org/package">
    <name>Jane Doe</name>
    <ns2:account>36328721</ns2:account>
</ns3:customer>

Only the account element is qualified with the "http://www.example.org/property" namespace.

Default Root Element	Mapping to a Type or Element	Creating Objects (Constructors & Factories)
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