Learning Document Structure

When working with documents that do not specify a schema, or for which the schema is not known or does not exist, Oxygen XML Author plugin is able to learn and translate the document structure to a DTD. You can choose to save the learned structure to a file in order to provide a DTD as an initialization source for content completion and document validation. This feature is also useful for producing DTD's for documents containing personal or custom element types.

When you open a document that is not associated with a schema, Oxygen XML Author plugin automatically learns the document structure and uses it for content completion. To disable this feature you have to uncheck the checkbox Learn on open document in the user preferences.