`create_envelope()` DSL command returns an error

[dkoslicki]

Apparently xDTD requires you create a message before using infer(action=drug_treatment_graph_expansion), but doing so returns

ERROR: Unrecognized command create_envelope

for the input

create_envelope()
infer(action=drug_treatment_graph_expansion,node_curie=MONDO:0007827)

It appears that create_message does work though. Any thoughts @isbluis if this is just a mis-naming of a DSL command that the UI slurped up?