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2.5.1 Draft

   One of the OpenDoc advantages of the OpenDoc storage system is that 
   OpenDoc allows you to have a history of OpenDoc documents called drafts. 
   A draft is a specific version of an OpenDoc document.  Multiple drafts can 
   be maintained within a single document as shown in the Draft History (see 
   Figure 28).  The actual document is not included because it has not yet 
   been saved as an actual draft. 

   Under the edit menu there is an Open selection menu item which can be used 
   to open the selected draft. To revert to a previous draft, the user must 
   move or copy the draft somewhere else (to the desktop for example). 


 


                                              



 
   Figure 28. Draft History 

   Drafts apply to documents, not parts, and they store only those items of a 
   document that have changed in each draft.  The newest version of a draft 
   is stored completely as a current draft (see Figure 29) in the file; the 
   elder versions can be reconstructed by the delta saved in the same Bento 
   file. 


 


                                              



 
   Figure 29. OpenDoc Storage System Hierarchical Structure 

   It is an incremental save done in a reverse order.  By this incremental 
   save, several drafts of a document can be stored in one file edited by 
   different people, without fear of excessive disk space requirements. 

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