diff --git a/vip_spec.xsd b/vip_spec.xsd
index a8279d17..58d38469 100644
--- a/vip_spec.xsd
+++ b/vip_spec.xsd
@@ -528,12 +528,6 @@ reference elements for polling location
       <xs:enumeration value="odd"/>
       <xs:enumeration value="even"/>
       <xs:enumeration value="both"/>
-      <xs:enumeration value="Odd"/>
-      <xs:enumeration value="Even"/>
-      <xs:enumeration value="Both"/>
-      <xs:enumeration value="ODD"/>
-      <xs:enumeration value="EVEN"/>
-      <xs:enumeration value="BOTH"/>
     </xs:restriction>
   </xs:simpleType>