Summary of the Invention It is an. object of the present invention to provide a document processing system in which object-oriented frameworks are utilized to implement particular document processing techniques, including an object-oriented compound document system. These and other objects of the present invention are realized by a document framework which supports at the system level a variety of compound document processing functions. The framework provides system level support of collaboration, linking, eternal undo, and content based retrieval. These and other objects are carried out by system level support of document changes, annotation through model and linking, anchors, model hierarchies, enhanced copy and pasting, command objects, and a generic retrieval framework.
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