Errata exists for this version of the document.
A DataValue value is encoded as a xs:complexType with the following XML schema:
<xs:complexType name="DataValue">
<xs:sequence>
<xs:element name="Value" type="tns:Variant" minOccurs="0"
nillable="true" />
<xs:element name="StatusCode" type="tns:StatusCode"
minOccurs="0" />
<xs:element name="SourceTimestamp" type="xs:dateTime"
minOccurs="0" />
<xs:element name="SourcePicoseconds" type="xs:unsignedShort"
minOccurs="0"/>
<xs:element name="ServerTimestamp" type="xs:dateTime"
minOccurs="0" />
<xs:element name="ServerPicoseconds" type="xs:unsignedShort"
minOccurs="0"/>
</xs:sequence>
</xs:complexType>