code: public void buildFieldSubHeader(XMLNode node, Content fieldsContentTree) {
          if (!currentClass.definesSerializableFields()) {
              FieldDoc field = (FieldDoc) currentMember;
              fieldWriter.addMemberHeader(field.type().asClassDoc(),
                      field.type().typeName(), field.type().dimension(), field.name(),
                      fieldsContentTree);
          }
      }
docs: Build the field sub header.
  
  @param node the XML element that specifies which components to document
  @param fieldsContentTree content tree to which the documentation will be added