Issue#3

example-data/nfv-nsd.xml

-<nsd xmlns="urn:etsi:nfv:yang:etsi-nfv-nsd">
+<?xml version="1.0" encoding="UTF-8"?>
+<nfv xmlns="urn:etsi:nfv:yang:etsi-nfv-descriptors">
   <vnfd>
     <id>ASA</id>
     <provider>My Company</provider>
@@ -133,4 +134,4 @@
       </ns-instantiation-level>
     </df>
   </nsd>
-</config>
+</nfv>

src/yang/etsi-nfv-nsd.yang

@@ -28,10 +28,26 @@ module etsi-nfv-nsd {
   }
 
   container nsd {
+    list vnfd {
+      key "id";
+
+      description
+        "A VNF Descriptor (VNFD) is a deployment template which
+         describes a VNF in terms of deployment and operational
+         behaviour requirements. It also contains connectivity,
+         interface and virtualised resource requirements";
+      reference
+        "GS NFV-IFA011: Section 7.1.2, VNFD information element";
+
+      uses nfv:vnfd;
+    }
+
     list nsd {
       key "id";
+
       max-elements 1;
       uses nfv:nsd;
+
       description
 	"The NSD information element is a deployment template whose
          instances are used by the NFVO for the lifecycle management

src/yang/etsi-nfv-vnf.yang

@@ -95,6 +95,23 @@ submodule etsi-nfv-vnf {
           "GS NFV-IFA011: Section 7.1.6.6,
            VirtualNetworkInterfaceRequirements information element";
       }
+
+      leaf nic-io-requirements {
+	type leafref {
+          path "/nfv:nfv/nfv:vnfd/nfv:virtual-compute-desc/" +
+	       "nfv:logical-node/nfv:id";
+	}
+	description
+	  "This references (couples) the CPD with any logical node
+           I/O requirements (for network devices) that may have been
+           created. Linking these attributes is necessary so that I/O
+           requirements that need to be articulated at the logical
+           node level can be associated with the network interface
+           requirements associated with the CPD.";
+        reference
+          "GS NFV-IFA011: Section 7.1.6.6,
+           VirtualNetworkInterfaceRequirements information element";
+      }
     }
   }