IF_IXML : How can i add encoding with value UTF-8 to the document object??

Question

Hi
i want to create a xml file with the following content:
<?xml version="1.0" encoding="UTF-8"?>
<OpenSearchDescription xmlns="http://...."> 
</OpenSearchDescription>
i did this with the if_ixml interface and rendered the content in a file 'D:\usr\sap\IFD\DVEBMGS01\log\TEST_out.xml
<?xml version="1.0"?>
<OpenSearchDescription xmlns="http://...."> 
</OpenSearchDescription>
BUT the document attribut(?) encoding="UTF-8"?> is missing!
How can i add encoding with value UTF-8 to the document object?? it should look like:
<?xml version="1.0" encoding="UTF-8"?>
*here is my coding.
TYPE-POOLS: ixml.
CLASS cl_ixml DEFINITION LOAD.
DATA: lo_ixml           TYPE REF TO if_ixml,
      lo_streamfactory  TYPE REF TO if_ixml_stream_factory,
      lo_document       TYPE REF TO if_ixml_document,
      lo_parent         TYPE REF TO if_ixml_element,
      lo_ostream        TYPE REF TO if_ixml_ostream,
      lo_renderer       TYPE REF TO if_ixml_renderer,
     lv_rc           TYPE i.
lo_ixml = cl_ixml=>create( ).
lo_streamfactory = lo_ixml->create_stream_factory( ).
lo_document = lo_ixml->create_document( ).
lo_parent = lo_document->create_simple_element( name   = 'OpenSearchDescription'  "root node
                                                parent = lo_document ).
lo_parent->set_attribute_ns( name   =  'xmlns'
                             value  = 'http://....' ).
*rausrendern in file
lo_ostream = lo_streamfactory->create_ostream_uri( system_id = 'D:\usr\sap\IFD\DVEBMGS01\log\TEST_out.xml' ).
lo_renderer = lo_ixml->create_renderer( ostream  = lo_ostream
                                        document = lo_document ).
lv_rc = lo_renderer->render( ).
Thanks for help
Britta

Answer 1

Use the following code:
set an document encoding
  l_encoding = l_ixml->create_encoding( character_set = 'UTF-8'
                                        byte_order = if_ixml_encoding=>co_none ).
  l_success  = l_ostream->set_encoding( encoding = l_encoding ).
create a xml renderer
  l_renderer = l_ixml->create_renderer( document = l_doc ostream  = l_ostream ).