Revision as of 17:11, 6 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;

This will produce the following XML:

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

package example;
 
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
 
@XmlRootElement
@XmlType(namespace="http://www.example.org/type")
public class Customer {
 
    private long id;
    private String name;
 
    @XmlAttribute
    public long getId() {
        return id;
    }
 
    public void setId(long id) {
        this.id = id;
    }
 
    @XmlElement(namespace="http://www.example.org/property")
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
}

This will produce the following XML:

<ns2:customer
    xmlns="http://www.example.org/property"
    xmlns:ns2="http://www.example.org/package"
    id="123">
    <name>Jane Doe</name>
</ns2:customer>

The Name 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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