The Classpath tab displays a list of folders and JAR libraries that hold implementations for API extensions, implementations for custom Author mode operations, various resources (such as stylesheets), and framework translation files. Oxygen XML Author Eclipse plugin loads the resources looking in the folders in the order they appear in the list (from top to bottom).
To open the Classpath tab of the Document type configuration dialog box, open the Preferences dialog box , go to Document Type Association, use the New, Edit, Duplicate, or Extend button, and click on the Classpath tab.
The Classpath tab includes the following actions:
New- Opens a dialog box that allows you to add a resource to the table in the
Classpath tab. You can
specify the path by using the text field, its history drop-down, the
Insert Editor
Variables button, or the browsing actions in the 
Browse drop-down list.Tip: The path can also contain wildcards (for example,${framework}/lib/*.jar). 
Edit- Opens a dialog box that allows you to edit a resource in the
Classpath tab. You can
specify the path by using the text field, its history drop-down, the Insert Editor
Variables button, or the browsing actions in the Browse drop-down list.Tip: The path can also contain wildcards (for example,
${framework}/lib/*.jar). 
Delete- Deletes the currently selected resource from the list.
Move
Up- Moves the selected resource up one spot in the list.
Move
Down- Moves the selected resource down one spot in the list.