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<div class="parentlink"><strong>Parent topic:</strong> <a class="link" href="../dev_ref/plugins-overview.html" title="The DITA Open Toolkit comes with a built in mechanism for adding in extensions through plug-ins. These plug-ins may do a wide variety of things, such as adding support for specialized DITA DTDs or Schemas, integrating processing overrides, or even providing entirely new output transforms. Plug-ins are the best way to extend the toolki