Associating a Schema With the Namespace of the Root Element

The namespace of the root element of an XML document can be associated with an XML Schema using an XML catalog. If there is no xsi:schemaLocation attribute on the root element and the XML document is not matched with a document type, the namespace of the root element is searched in the XML catalogs set in Preferences.

If the XML catalog contains a uri or rewriteUri or delegateUri element, its schema will be used by the application to drive the content completion and document validation.