+// Need to mention columns explicitly as we want hrn which is a tag
+$columns=array ('hostname','boot_state','run_level','site_id','model','node_type','version',
+ 'slice_ids','conf_file_ids','interface_ids','nodegroup_ids','peer_id',
+ 'pcu_ids','ports','hrn');
+$nodes= $api->GetNodes( array($node_id),$columns);