11. A method according to claim 1 , comprising the further step of: using a computer to constrain evolution of a schema associated with the document.
11. A method according to claim 1 , comprising the further step of: using a computer to constrain evolution of a schema associated with the document. 12. The method according to claim 11 , wherein said valid changes are selected from the group consisting of rename, relocate, retype, and a combination thereof.