Index: DamEngine/trunk/xsd/DamTimeSerie.xsd
===================================================================
diff -u -r972 -r1554
--- DamEngine/trunk/xsd/DamTimeSerie.xsd	(.../DamTimeSerie.xsd)	(revision 972)
+++ DamEngine/trunk/xsd/DamTimeSerie.xsd	(.../DamTimeSerie.xsd)	(revision 1554)
@@ -11,7 +11,7 @@
           <xs:attribute name="MultiplierSpecified" type="xs:boolean" use="required" />
           <xs:attribute name="TimeStepUnit" use="required">
             <xs:simpleType>
-              <xs:restriction base="xs:string">
+              <xs:restriction base="xs:unsignedInt">
                 <xs:enumeration value="Second" />
                 <xs:enumeration value="Minute" />
                 <xs:enumeration value="Hour" />