diff --git a/example-data/nfv.xml b/example-data/nfv.xml
index a956b2b51ebb5f5c36cab9095f918b8eefc8bded..c1c1619b6282ba85e592a9006a306ed1ba22c8a9 100644
--- a/example-data/nfv.xml
+++ b/example-data/nfv.xml
@@ -36,7 +36,7 @@
     </virtual-compute-descriptor>
     <virtual-storage-descriptor>
       <id>asa-vsd</id>
-      <type-of-storage>root</type-of-storage>
+      <type-of-storage>root-storage</type-of-storage>
       <size-of-storage>0</size-of-storage>
     </virtual-storage-descriptor>
     <sw-image-desc>
@@ -131,7 +131,7 @@
     </virtual-compute-descriptor>
     <virtual-storage-descriptor>
       <id>csr-vsd</id>
-      <type-of-storage>root</type-of-storage>
+      <type-of-storage>root-storage</type-of-storage>
       <size-of-storage>0</size-of-storage>
     </virtual-storage-descriptor>
     <sw-image-desc>
diff --git a/src/yang/etsi-nfv-common.yang b/src/yang/etsi-nfv-common.yang
index 2f6a69a9329b3a886411cb0e17c6bf6d1763cf20..b50297c35e60814d8f712f957098ffeb43213bb1 100644
--- a/src/yang/etsi-nfv-common.yang
+++ b/src/yang/etsi-nfv-common.yang
@@ -216,7 +216,30 @@ submodule etsi-nfv-common {
     reference
       "GS NFV IFA011: Section 7.1.6.10 Checksum information element.";
   }
-      
+
+  identity storage-type {
+    description
+      "Base type of storage that identities can derive from.";
+  }
+
+  identity root-storage {
+    base storage-type;
+    description
+      "Root type of storage.";
+  }
+
+  identity swap-storage {
+    base storage-type;
+    description
+      "Swap type of storage.";
+  }
+
+  identity ephemeral-storage {
+    base storage-type;
+    description
+      "Ephemeral type of storage.";
+  }
+  
   /*
    * Typedefs
    */
diff --git a/src/yang/etsi-nfv-vnf.yang b/src/yang/etsi-nfv-vnf.yang
index 28e81604b242e555174edc0c35932dbccc565928..ed971b948a6241b6153b8dfbf35ada14a2879fbe 100755
--- a/src/yang/etsi-nfv-vnf.yang
+++ b/src/yang/etsi-nfv-vnf.yang
@@ -733,12 +733,10 @@ submodule etsi-nfv-vnf {
 
         leaf type-of-storage {
           // Needed to be able to onboard images
-          type enumeration {
-            enum "root";
-            enum "swap";
-            enum "ephemeral";
-          }
-          default "root";
+          default "root-storage";
+          type identityref {
+	    base storage-type;
+	  }
           description
             "Type of virtualised storage resource (e.g. volume,
              object).";