Problem statement:  understanding and interpretations of document versioning

                    understanding and interpretations of document[s] compression

               Currently there are several file formats that support compression
               say such as .zip , .tar ,.bzip ...etc.

Opportunity: Deriving from the above ...a portable document format that
             can be usable in collabration , communication ...in office automation
             and group-ware solutions ...that supports versioning.

             ex: this is only a indicative or for illustration ...how about winzip
                 or winrar supports versioning of the documents embedded in the compressed
                 file.

                 in scenarios like ...XML-RSS ...feeds!! ...potential scope for optimization
                 when ...the operating systems support versioning of files embedded in them.

Note: The above problem statement having been encountered in various scenarios
      and detailed in various 'Proof of concepts' as mentioned in 
      'http://uk.geocities.com/ravivenkatus/projects.pdf' ....apply appropriate
      'use-case' modeling, rationalize and arrive at a workable and feasible 
       solution both commercially and techinically viable.