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When there is no schema associated with an XML document, Oxygen XML Author Eclipse plugin can learn the document structure by parsing the document internally. This feature is enabled by the Learn on open document option that is available in the user preferences.

To create a DTD from the learned structure, follow these steps:

  1. Open the XML document that will be used to create the DTD.
  2. Go to XML > Learn Structure (Ctrl + Shift + L (Command + Shift + L on OS X)).
    The Learn Structure action reads the mark-up structure of the current document. The Learn completed message is displayed in the application status bar when the action is finished.
  3. Go to XML > Save Structure (Ctrl + Shift + S (Command + Shift + S on OS X)) and enter the DTD file path.
  4. Click the Save button.