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Parameter direction kind is an enumeration type that defines literals used to specify direction of parameters.
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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.