Protected Overridable Function ValidateMonitoringFilter( _
   ByVal context As ServerSystemContext, _
   ByVal handle As NodeHandle, _
   ByVal attributeId As UInteger, _
   ByVal samplingInterval As Double, _
   ByVal queueSize As UInteger, _
   ByVal filter As ExtensionObject, _
   ByRef filterToUse As MonitoringFilter, _
   ByRef range As Range, _
   ByRef result As MonitoringFilterResult _
) As StatusCode

protected virtual StatusCode ValidateMonitoringFilter( 
   ServerSystemContext context,
   NodeHandle handle,
   uint attributeId,
   double samplingInterval,
   uint queueSize,
   ExtensionObject filter,
   out MonitoringFilter filterToUse,
   out Range range,
   out MonitoringFilterResult result
)