code: Rule FieldLength() {
  		return Sequence(String("L:"),
  				ZeroOrMore(WSP()).suppressNode(),
  				NoteLengthStrict(), HeaderEol()).label(FieldLength);
  	}
docs: Default note length
  
  field-length ::= %x4C.3A *WSP note-length-strict header-eol<p>
  <tt>L:</tt>