Icarus Class: ValidationRule
Description of a validation rule for the application options.
name Attribute may stay unnamed in attribute list.Attribute value must be specified.
  Name of the validation rule.
condition  
  Icarus expression to be evaluated as the condition of the validation rule.
action  
  Action to be performed if evaluation of the condition returns true.
message  
  Message to the user when the rule is fired, i.e condition is true.
ruleType  
  Use one of the following values. action except
  Rules can perform an 'action' to correct the validation condition, or throw an exception with the 'message' back to the user