maybe

[[ [ IDL-operation-attributes ] ]] operation-attribute , ...

IDL-operation-attributes

Specifies zero or more IDL operation attributes, such as maybe and idempotent. Operation attributes are enclosed in square brackets.

Remarks

The keyword maybe indicates that the remote procedure call does not need to execute every time it is called and the client does not expect a response. Note that the maybe protocol ensures neither delivery nor completion of the call.

A call with the maybe attribute cannot contain output parameters and is implicitly an idempotent call.