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          | Get_count(self,
        Datatype datatype=BYTE) Get the number of top level elements
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          | Get_elements(self,
        Datatype datatype) Get the number of basic elements in a datatype
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          | Get_error(self) Get message error
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          | Get_source(self) Get message source
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          | Get_tag(self) Get message tag
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          | Is_cancelled(self) Test to see if a request was cancelled
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          | Set_cancelled(self,
        bool flag) Set the cancelled state associated with a status
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          | Set_elements(self,
        Datatype datatype,
        Count count) Set the number of elements in a status
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          | Set_error(self,
        int error) Set message error
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          | Set_source(self,
        int source) Set message source
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          | Set_tag(self,
        int tag) Set message tag
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    | a new object with type S, a subtype of T |  | 
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