code: public Item getFieldItem(String name) {
          if (xfa.isXfaPresent()) {
              name = xfa.findFieldName(name, this);
              if (name == null)
                  return null;
          }
          return (Item)fields.get(name);
      }
docs: Gets the field structure.
  
  @param name the name of the field
  @return the field structure or <CODE>null</CODE> if the field
  does not exist