question: private boolean checkValidation ( final SourceDataTag currentSourceDataTag , final ValueUpdate update ) { if ( ! isTimestampValid ( currentSourceDataTag , update ) ) { return false ; } if ( ! isConvertible ( currentSourceDataTag , update ) ) { return false ; } if ( isNumber ( currentSourceDataTag . getDataType ( ) ) && ! isInRange ( currentSourceDataTag , update ) ) { return false ; } return true ; }
target:  Helper method which validates the new tag value and triggers an invalidation in case of a problem