code: private static int computeDecimalSize(AttributeValue value) throws DBaseFileException, AttributeException {
  		final DBaseFieldType dbftype = DBaseFieldType.fromAttributeType(value.getType());
  		return dbftype.getDecimalPointPosition(value.getString());
  	}
docs: Replies the decimal size of the DBase field which must contains the
  value of the given attribute value.
  
  @throws DBaseFileException if the Dbase file cannot be read.
  @throws AttributeException  if an attribute is invalid.