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A marker interface for objects providing portlet data. This can be used as a marker by implementations requiring a regular content object to be able to be "switched on" as a portlet. Alternatively, a more specific sub-interface can provide the necessary information to render the portlet. An adapter should exist from the specific type of IPortletDataProvider to an appropriate IPortletViewlet to render it. The data provider will also be referenced in an IPortletAssignment so that it can be retrieved on demand.