<xsd:complexType name="HeaderType">
				<xsd:sequence>
					<xsd:element name="Verb">
						<xsd:simpleType>
							<xsd:restriction base="xsd:string">
								<xsd:enumeration value="GET" />
								<xsd:enumeration value="CREATE" />
								<xsd:enumeration value="UPDATE" />
								<xsd:enumeration value="DELETE" />
							</xsd:restriction>
						</xsd:simpleType>
					</xsd:element>
					<xsd:element name="Noun" type="xsd:string" />
					<xsd:element name="Revision" type="xsd:string" minOccurs="0" />
					<xsd:element name="ReplayDetection" type="msg:ReplayDetectionType" minOccurs="0" />
					<xsd:element name="Context" minOccurs="0">
						<xsd:simpleType>
							<xsd:restriction base="xsd:string">
								<xsd:enumeration value="PRODUCTION" />
								<xsd:enumeration value="TESTING" />
								<xsd:enumeration value="DEVELOPMENT" />
								<xsd:enumeration value="STUDY" />
								<xsd:enumeration value="TRAINING" />
							</xsd:restriction>
						</xsd:simpleType>
					</xsd:element>
...
</xsd:complexType>

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "HeaderType", propOrder = { "verb", "noun", "revision", "replayDetection",
		"context", "timestamp", "source", "asyncReplyFlag", "replyAddress", "ackRequired", "user",
		"messageID", "correlationID", "comment", "property" })
public class HeaderType {

	@XmlElement(name = "Verb", required = true)
	protected String verb;
	@XmlElement(name = "Noun", required = true)
	protected String noun;
	@XmlElement(name = "Revision")
	protected String revision;
	@XmlElement(name = "ReplayDetection")
	protected ReplayDetectionType replayDetection;
	@XmlElement(name = "Context")
	protected String context;
...
}