Add ellipsoidalRegion and rectangularRegion to realListXMLListType

SI_Format.xsd

@@ -614,6 +614,16 @@
 					<xs:element name="expandedUncXMLList" type="si:expandedUncXMLListType"/>
 					<xs:element name="coverageIntervalXMLList" type="si:coverageIntervalXMLListType"/>
 				</xs:choice>
+				
+				<xs:choice minOccurs="0">
+					<xs:annotation>
+						<xs:documentation xml:lang="en">
+							multivariate measurement uncertainty
+						</xs:documentation>
+					</xs:annotation>
+					<xs:element name="ellipsoidalRegion" type="si:ellipsoidalRegionType"/>
+					<xs:element name="rectangularRegion" type="si:rectangularRegionType"/>
+				</xs:choice>
 			</xs:sequence>
 		</xs:complexType>