minor corrections to CMSIS-PACK
diff --git a/CMSIS/Utilities/PACK.xsd b/CMSIS/Utilities/PACK.xsd
index 06a5ba1..0d31c21 100644
--- a/CMSIS/Utilities/PACK.xsd
+++ b/CMSIS/Utilities/PACK.xsd
@@ -1060,6 +1060,7 @@
       <xs:enumeration value="schematic"/>
       <xs:enumeration value="overview"/>
       <xs:enumeration value="manual"/>
+      <xs:enumeration value="layout"/>
       <xs:enumeration value="other"/>
     </xs:restriction>
   </xs:simpleType>