+Subscribe RPC also supports options for label using
+ --lop=APPEND/DELETE/OVERWRITE
+and for supported template types using
+ --top=APPEND/DELETE/OVERWRITE.
+When unspecified, the default is APPEND.
+DELETE deletes existing labels (template types) specified in the current call via key -l/--label (-t/--ttype).
+OVERWRITE removes the current set of labels (template types) and sets it to the new set of values passed in the same RPC call.
+
+By default, no translation service is provided. Currently, only TOSCA to Heat
+Orchestration Template (HOT) translation is supported using OpenStack
+heat-translator library. A domain that requires HOT files must subscribe HOT
+template type using
+