A date time stamp
<xs:element name="valueDateTime"> <xs:annotation> <xs:documentation xml:lang="en-US">A date time stamp</xs:documentation> </xs:annotation> <xs:complexType> <xs:attribute name="value" type="TimeStampOptionalTimezone"/> </xs:complexType> </xs:element>
<xs:attribute name="value" type="TimeStampOptionalTimezone"/>