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Oxygen XML Author Eclipse plugin uses document type associations to associate a document type with a set of functionality provided by a framework. To configure the Document Type Association options, open the Preferences dialog box and go to Document Type Association.

The following actions are available in this preferences page:
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Document Type Table
This table presents the currently defined frameworks (document type associations), sorted by priority and alphabetically. Each edited document type has a set of association rules (used by the application to detect the proper document type association to use for an open XML document).
New
Opens a Document type configuration dialog box that allows you to add a new framework.
Edit
Opens a Document type configuration dialog box that allows you to edit an existing framework.
Note: If you try to edit an existing framework when you do not have write permissions to its storage location, a dialog box will be shown asking if you want to extend it.
Duplicate
Opens a Document type configuration dialog box that allows you to duplicate the configuration of an existing framework. This will create a snapshot of the framework in its current form. It is merely a copy of the document type and will not evolve along with the base document type as the Extend action does.
Extend
Opens a Document type configuration dialog box that allows you to extend an existing framework. You can add or remove functionality starting from a base document type. All of these changes will be saved as a patch. When the base document type is modified and evolves (for example, from one application version to another) the extension will evolve along with the base document type, allowing it to use the new actions added in the base document type.
Delete
Deletes the selected framework (document type).
Enable DTD/XML Schema processing in document type detection
When this option is selected (default value), the matching process also examines the DTD/XML Schema associated with the document. For example, the fixed attributes declared in the DTD for the root element are also analyzed, if this is specified in the association rules. This is especially useful if you are writing DITA customizations. DITA topics and maps are also matched by looking for the @DITAArchVersion attribute of the root element. This attribute is specified as default in the DTD and it is detected in the root element, helping Oxygen XML Author Eclipse plugin to correctly match the DITA customization.
Only for local DTDs/XML Schemas
When this option is selected (default value), only the local DTDs / XML Schemas will be processed.
Enable DTD/XML Schema caching
When this option is selected (default value), the associated DTDs or XML Schema are cached when parsed for the first time, improving performance when opening new documents with similar schema associations.