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TfrDataManager abstract methods

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Borneq:
Lazreport is based on FreeReport. I am currently translate FreeReport binary frf files <-> xml files.
Is part of TfrDataManager

--- Code: Pascal  [+][-]window.onload = function(){var x1 = document.getElementById("main_content_section"); if (x1) { var x = document.getElementsByClassName("geshi");for (var i = 0; i < x.length; i++) { x[i].style.maxHeight='none'; x[i].style.height = Math.min(x[i].clientHeight+15,306)+'px'; x[i].style.resize = "vertical";}};} ---    else if b = $FD then // datasets    begin      if frDataManager <> nil then        frDataManager.LoadFromStream(Stream);      break;    endIs always nil, but frf binary files have this data.
LoadFromStream,SaveToStream and LazReport's LoadFromXML,SaveToXML are abstract and I don't found class derived from TfrDataManager. Where is code ot this four methods?

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