The read and write XML methods support before-image tables in ProDataSets. If the ProDataSet has defined before-image tables, then they will be handled appropriately:

  • If a ProDataSet has before-tables and the READ-XML( ) method finds before-image data in the XML data, then that data is read in. Before-image data can be in one of two formats:
    • ABL before-image format
    • Microsoft DiffGram format
  • If a static ProDataSet member buffer does not define a before-image table and the XML data contains before-image data for that buffer, then READ-XML( ) fails.
  • If the READ-XML( ) method reads data into a dynamic ProDataSet and detects before-image data for one or more of the temp-table buffers, then the method automatically creates a before-image table for each buffer with before-image data.