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Parameter declarations in OMG IDL operation declarations have the following syntax:
(90) <parameter_dcls> ::= “(? <param_dcl> { “,? <param_dcl> }∗ “)? | “(? “)?
(91) <param_dcl> ::= <param_attribute> <param_type_spec> <simple_declarator>
(92) <param_attribute> ::= “in?| “out?| “inout?
(95) <param_type_spec> ::= <base_type_spec>| <string_type>| <wide_string_type>| <scoped_name>
A parameter declaration must have a directional attribute that informs the communication service in both the client and the
server of the direction in which the parameter is to be passed. The directional attributes are:
• in - the parameter is passed from client to server.
• inout - the parameter is passed in both directions.
• out - the parameter is passed from server to client.
It is expected that an implementation will not attempt to modify an in parameter. The ability to even attempt to do so is
language-mapping specific; the effect of such an action is undefined.
If an exception is raised as a result of an invocation, the values of the return result and any out and inout parameters are
undefined.