New <stageNotes> within the existing <creation> element containing new <stageNote> elements to document identified "writing stages" in
genesis of a text. New att.staged class to supply @stage attributes for elements which can be assigned to a given writing stage. These allow marked up elements to be assigned to particular stages in the genesis of a text, or the writing of a document, or both!
Justification, element specs, and examples are in the Genetic WG document at http://www.tei-c.org/Activities/Council/Working/tcw19.html (derived from http://tei.svn.sourceforge.net/viewvc/tei/trunk/genetic/\)