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DITA-OT-DIR

DITA_OT_DIR refers to the default directory that is specified for your DITA Open Toolkit distribution in the Options > Preferences > DITA preferences page.

For example, if you are using DITA-OT 4.1.2 that comes bundled with Oxygen XML Author, the default directory is: [OXYGEN_INSTALL_DIR]/frameworks/dita/DITA-OT. You can also specify a custom directory.