code: public String get(String columnCode) throws UnknownColumnException {
  		for (DataColumn column : columns) {
  			if (columnCode.equals(column.getCode())) {
  				return content.get(column);
  			}
  		}
  		throw new UnknownColumnException(columnCode);
  	}
docs: Returns this row's content for the given column.
  
  @param columnCode the column to read
  @return this row's content for the given column
  @throws UnknownColumnException if the column doesn't exist