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diff --git a/opendaylight/model/model-inventory/src/main/yang/opendaylight-inventory.yang b/opendaylight/model/model-inventory/src/main/yang/opendaylight-inventory.yang
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+++ b/opendaylight/model/model-inventory/src/main/yang/opendaylight-inventory.yang
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+module opendaylight-inventory {
+    namespace "urn:opendaylight:inventory";
+    prefix inv;
+
+    import yang-ext {prefix ext; revision-date "2013-07-09";}
+    import ietf-inet-types {prefix inet; revision-date "2010-09-24";}
+
+
+    revision "2013-08-19" {
+        description "Initial revision of Inventory model";
+    }
+
+
+    typedef support-type {
+        type enumeration {
+            enum native;
+            enum emulated;
+            enum not-supported;
+        }
+    }
+
+    typedef node-id {
+        type inet:uri;
+        description "Identifier for a particular node. For example:
+
+                        myprotocol:<unique_node_id>
+
+                        myprotocol:12
+
+                    It is a good practice to always lead with a scoping identifier.
+                    In the example above the scoping was 'myprotocol'. In your app you
+                    could use 'myapp' etc.";
+    }
+
+    typedef node-connector-id {
+        type inet:uri;
+        description "Identifier for a particular node-connector. For example:
+
+                        myprotocol:<unique_node_connector_id>
+                        myprotocol:3
+
+                    It is a good practice to always lead with a scoping identifier.
+                    In the example above the scoping was 'myprotocol'. In your app you
+                    could use 'myapp' etc.";
+
+    }
+
+    //YANG does not have a statement which limits the scope of an instance-identifier to a particular subtree,
+    //which is why we are using a type capture and not an instance-identifier to define a node-ref and a node-connector-ref.
+    typedef node-ref {
+        type instance-identifier;
+        description "A reference that points to an opendaylight-light:nodes/node in the data tree.";
+    }
+
+    typedef node-connector-ref {
+        type instance-identifier;
+        description "A reference that points to an opendaylight-list:nodes/node/{node-id}/node-connector in the data tree.";
+    }
+
+    identity node-context {
+        description "A node-context is a classifier for node elements which allows an RPC to provide a service on behalf of a particular element in the data tree.";
+    }
+
+    identity node-connector-context {
+        description "A node-connector-context is a classifier for node-connector elements which allows an RPC to provide a service on behalf of a particular element in the data tree.";
+    }
+
+    //We are defining a base identity here because there are limitations with yang enums. Yang doesn't allow you to extend enumeratations.
+    //Therefore by defining a base identity we allow other yang files to extend this identity to define additional "enumerations". By
+    //using node-type as their base they are able to pass their object to fields that accept "node-types" while uniquely describing their
+    //type of node, such as "router-node" or "switch-node" etc.
+    //See https://wiki.opendaylight.org/view/YANG_Tools:YANG_to_Java_Mapping#Identity for more information.
+    identity node-type {
+        description "A base identity definition which represents a generic node type and can be extended in other yang files.";
+    }
+
+    identity node-connector-type {
+        description "A base identity definition which represents a generic node connector type and can be extended in other yang files.";
+    }
+
+    grouping node {
+
+        description "Describes the contents of a generic node -
+                     essentially an ID and a list of node-connectors.
+                     Acts as an augmentation point where other yang files
+                      can add additional information.";
+
+        leaf id {
+            type node-id;
+            description "The unique identifier for the node.";
+        }
+
+        list "node-connector" {
+            key "id";
+
+            description "A list of node connectors that belong this node.";
+            ext:context-instance "node-connector-context";
+
+            uses node-connector;
+        }
+    }
+
+    grouping node-connector {
+
+        description "Describes a generic node connector which consists of an ID.
+                     Acts as an augmentation point where other yang files can
+                      add additional information.";
+
+        leaf id {
+            type node-connector-id;
+            description "The unique identifier for the node-connector.";
+        }
+    }
+
+    grouping node-context-ref {
+        description
+        "A helper grouping which contains a reference to a node classified with a node-context. This allows RPCs in other yang files to refine their input to a particular node instance.";
+
+        leaf node {
+            ext:context-reference "node-context";
+            type node-ref;
+            description "A reference to a particular node.";
+        }
+    }
+
+    /** Base structure **/
+    container nodes {
+
+        description "The root container of all nodes.";
+
+        list node {
+            key "id";
+            ext:context-instance "node-context";
+            description "A list of nodes (as defined by the 'grouping node').";
+            uses node; //this refers to the 'grouping node' defined above.
+        }
+    }
+
+    //The following notifications should really be replaced by direct writes to the data tree with data change listeners listening to those changes.
+    //Notifications should be reserved for one time events which do not require persistence to the data tree.
+    notification node-updated {
+
+        status deprecated;
+
+        description "A notification sent by someone who realized there was a modification to a node, but did not modify the data tree.
+                    Describes that something on the node has been updated (including addition of a new node), but is for
+                    whatever reason is not modifying the data tree.
+
+                    Deprecated: If a process determines that a node was updated, then that
+                    logic should update the node using the DataBroker directly. Listeners interested
+                    update changes should register a data change listener for notifications on removals.";
+
+        leaf node-ref {
+            ext:context-reference "node-context";
+            description "A reference to the node which changed.";
+
+            type node-ref;
+        }
+        uses node;
+    }
+
+    notification node-connector-updated {
+
+        status deprecated;
+
+        description "A notification sent by someone who realized there was a modification to a node-connector, but did not modify the data tree.
+                    Describes that something on the node-connector has been updated (including addition of a new node-connector), but is for
+                    whatever reason is not modifying the data tree.
+
+                    Deprecated: If a process determines that a node-connector was updated, then that
+                    logic should update the node-connector using the DataBroker directly. Listeners interested
+                    update changes should register a data change listener for notifications on removals.";
+
+        leaf node-connector-ref {
+            ext:context-reference "node-connector-context";
+            type node-connector-ref;
+            description "A reference to the node-connector which changed.";
+        }
+        uses node-connector;
+    }
+
+    notification node-removed {
+
+        status deprecated;
+
+        description "A notification sent by someone who realized there was a node was removed, but did not modify the data tree.
+                    Describes that a node has been removed but is for
+                    whatever reason is not modifying the data tree.
+
+                    Deprecated: If a process determines that a node was removed, then that
+                    logic should remove the node from the DataBroker directly. Listeners interested
+                    in changes should register a data change listener for notifications on removals.";
+
+        leaf node-ref {
+            description "A reference to the node that was removed.";
+            ext:context-reference "node-context";
+            type node-ref;
+        }
+    }
+
+    notification node-connector-removed {
+
+        status deprecated;
+
+        description "A notification sent by someone who realized there was a node-connector was removed, but did not modify the data tree.
+                    Describes that a node-connector has been removed but is for
+                    whatever reason is not modifying the data tree.
+
+                    Deprecated: If a process determines that a node-connector was removed, then that
+                    logic should remove the node-connector from the DataBroker directly. Listeners interested
+                    in changes should register a data change listener for notifications on removals.";
+
+        leaf node-connector-ref {
+            description "A reference to the node-connector that was removed.";
+            ext:context-reference "node-connector-context";
+            type node-connector-ref;
+        }
+    }
+}