anchor.diff:  
     PUBLIC SECTION.
       CLASS-METHODS: serialize IMPORTING is_item TYPE st_item
  -                             RETURNING VALUE(rt_files) TYPE tt_files
  +                             RETURNING value(rt_files) TYPE tt_files
                                RAISING lcx_exception.
   
       CLASS-METHODS: deserialize IMPORTING is_item TYPE st_item
  
positive.code: 
      CREATE OBJECT lo_xml.
      lo_xml->structure_add( ls_dd25v ).
      lo_xml->table_add( lt_dd26e ).
      lo_xml->table_add( lt_dd27p ).
  
      ls_file = xml_to_file( is_item = is_item
                             io_xml  = lo_xml ).
  
negative.code: 
    PUBLIC SECTION.
      CLASS-METHODS: serialize IMPORTING is_item TYPE st_item
                               RETURNING value(rt_files) TYPE tt_files
                               RAISING lcx_exception.
  
      CLASS-METHODS: deserialize IMPORTING is_item TYPE st_item
  