On Wed, 29 Aug 2018, Wolfgang Schuster wrote:

>> The second question: Is there the possibility to enhance the syntax so 
>> that one can write
>>>
>>>     \startMyStuff [optionalkey=value, anotherkey=value]
>>>          stuff
>>>     \stopMyStuff
>>>
>>> instead of
>>>
>>>     \startuserdata [MyStuff] [optionalkey=value, anotherkey=value]
>>>     stuff
>>>     \stopuserdata
>
> I can generated environment commands but I haven’t done this at the 
> beginning because I prefer to pass the name of the environment as 
> argument because this allows me to check if the used instance exists.

Perhaps adding a `command=yes` key, which can be set to `no` by default.

Aditya