Application of Multiple Content Items and Functionality to an Electronic Content Item

Application of content and associated functionality from multiple content sources to an electronic content item is provided. Content from a first document may be displayed over a second document via a user interface component. If desired, such content may be inserted into the second document, and application functionality associated with the inserted content may be retained after it is inserted into the second document. One or more navigation means may be provided for conveniently navigating inside a content item (e.g., a document) for adding new content or for reviewing or editing existing content. In addition, a number of content views and content mappings may be provided.