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To specify a folder for loading the custom XML refactoring operations, open the Preferences dialog box (Options > Preferences) and go to XML > XML Refactoring. The following option is available in this preferences page:
Load additional refactoring operations from
Use this text box to specify a folder for loading custom XML refactoring operations. You can specify the path by using the text field, the Insert Editor Variables button, or the Browse button. Oxygen XML Editor looks for XML refactoring operations recursively in the specified folder, so they can be stored in descendant folders.