DITA Preferences
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To access the DITA Preferences page, open the Preferences dialog box and go to DITA. This preferences page includes the following sections and options:

DITA Open Toolkit section
This section allows you to specify the default directory of the DITA Open Toolkit distribution (bundled with the Oxygen XML Developer plugin installation) to be used for validating and publishing DITA content. You can select from the following:
Built-in DITA-OT 3.x
Oxygen XML Developer plugin comes bundled with DITA-OT 3.2.1. By default, all defined DITA transformation/validation scenarios will run with this version. This also provides access to DITA 1.3 features (including document templates). The default DITA OT 3.2.1 directory is: [OXYGEN_INSTALL_DIR]/frameworks/dita/DITA-OT3.x.
Custom
Allows you to specify a custom directory for your DITA-OT distribution.
Location
You can either provide a new file path for the specific DITA OT that you want to use or select a previously used one from the drop-down list. You can specify the path by using the text field, the Insert Editor Variables button, or the Browse button.