6. The system according to claim 1 , wherein, when the user-modifiable document is revised by a user, the processor automatically saves the revised user-modifiable document as a new version.
6. The system according to claim 1 , wherein, when the user-modifiable document is revised by a user, the processor automatically saves the revised user-modifiable document as a new version. 7. The system according to claim 6 , wherein a revised data hierarchy is attached to the revised user-modifiable document.