[Attribute] Visibility [Required] No [Description] Indicates whether the user can see and set the parameter. A True value indicates that the user can see and set the parameter. A false value indicates that the user cannot see or set the parameter, and that the parameter can only be used by the test developer. This attribute only applies when the parameter is a global parameter (that is, when the Parameters element that is the parent of this Parameter element is a child of the DiagnosticTest element). For a parameter that you define for a specific stage of the diagnostic test, the visibility is automatically false and cannot be set. In other words, the visibility is automatically false when the Parameters element that is the parent of this Parameter element is a child of the PreStep, RunStep, or PostStep element. [Type] 
boolean
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