Index: DamEngine/trunk/xsd/DamLocation.xsd
===================================================================
diff -u -r2567 -r2575
--- DamEngine/trunk/xsd/DamLocation.xsd	(.../DamLocation.xsd)	(revision 2567)
+++ DamEngine/trunk/xsd/DamLocation.xsd	(.../DamLocation.xsd)	(revision 2575)
@@ -103,11 +103,11 @@
                 <xs:attribute name="PlLineOffsetFactorBelowShoulderCrest" type="xs:double" use="optional" />
                 <xs:attribute name="HeadPl3" type="xs:double" use="optional" />
                 <xs:attribute name="HeadPl4" type="xs:double" use="optional" />
-                <xs:attribute name="UpliftCriterionStability" type="xs:double" use="optional" />
-                <xs:attribute name="UpliftCriterionPiping" type="xs:double" use="optional" />
-                <xs:attribute name="RequiredSafetyFactorStabilityInnerSlope" type="xs:double" use="optional" />
-                <xs:attribute name="RequiredSafetyFactorStabilityOuterSlope" type="xs:double" use="optional" />
-                <xs:attribute name="RequiredSafetyFactorPiping" type="xs:double" use="optional" />
+                <xs:attribute name="UpliftCriterionStability" type="xs:double" use="required" />
+                <xs:attribute name="UpliftCriterionPiping" type="xs:double" use="required" />
+                <xs:attribute name="RequiredSafetyFactorStabilityInnerSlope" type="xs:double" use="required" />
+                <xs:attribute name="RequiredSafetyFactorStabilityOuterSlope" type="xs:double" use="required" />
+                <xs:attribute name="RequiredSafetyFactorPiping" type="xs:double" use="required" />
               </xs:complexType>
             </xs:element>
           </xs:sequence>