<ElementName attribute1="A" attribute2="B"" xsi:type="type" xmlns="some_namespace"/>

@XmlAccessorType(XmlAccessType.FIELD)

public class ElementName {
@XmlElement(name = "ElementName", nillable = true)
protected String value;
@XmlAttribute(name = "attribute1")
protected String attribute1;
@XmlAttribute(name = "attribute2")
protected String attribute2;
}

ElementName element = new ElementName();