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In the bottom section of the Document Type configuration dialog box, there are a series of tabs. The first one refers to the schema that is used for validation of the documents that match the defined Association Rules.

Important: If the document references a schema using a DOCTYPE declaration or a xsi:schemaLocation attribute, the schema from the document type configuration will not be used when validating.
Schema Type

Select from the combo box the value XML Schema.

Schema URI
Enter the value of the schema location (for example, ${frameworks}/sdf/schema/sdf.xsd). Use the ${frameworks} editor variable in the schema URI path instead of a full path to be valid for multiple Oxygen XML Editor installations.
Important: The ${frameworks} variable is expanded at the time of validation into the absolute location of the directory containing the framework.