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In the Schema tab, you can specify a default schema for Oxygen XML Editor to use if an XML document does not contain a schema declaration and no default validation scenario is associated with it.

To open the Schema tab of the Document type configuration dialog box, open the Preferences dialog box (Options > Preferences), go to Document Type Association, use the New, Edit, Duplicate, or Extend button, and click on the Schema tab.

This tab includes the following options for defining a schema to be used if no schema is detected in the XML file:
Schema type
Use this drop-down list to select the type of schema.
Schema URI
You can specify the URI of the schema file. 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: It is a good practice to store all resources in the framework directory and use the ${framework} editor variable to reference them. This is a recommended approach to designing a self-contained document type that can be easily maintained and shared between multiple users.