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   Parameter direction kind is an enumeration type that defines literals used to specify direction of parameters. 
   Generalizations 
   • none 
   ParameterDirectionKind is an enumeration of the following literal values: 
• in — Indicates that parameter values are passed into the behavioral element by the caller.
• return — Indicates that parameter values are passed as return values from a behavioral element back to the caller.
• inout — Indicates that parameter values are passed into a behavioral element by the caller and then back out to the caller from the behavioral element.
• out — Indicates that parameter values are passed from a behavioral element out to the caller.