toxml: rem. ns=0 in nodeid toString

src/ua/NodeId.ts

@@ -143,7 +143,10 @@ export class NodeId {
         const _this = this as INodeId;
         switch (_this.identifierType) {
             case NodeIdType.NUMERIC:
-                str = "ns=" + this.namespace + ";i=" + _this.value;
+                if(this.namespace===0)
+                    str = "i=" + _this.value;
+                else
+                    str = "ns=" + this.namespace + ";i=" + _this.value;
                 break;
             case NodeIdType.STRING:
                 str = "ns=" + this.namespace + ";s=" + _this.value;