Navigation of the content space of a document set

A method of enabling forward navigation in a content space, said method comprising:

• receiving a first message digest that identifies a first computer file;
• receiving a second message digest that identifies a second computer file;
• receiving an indication that said second computer file is a later version of said first computer file;
• creating a mapping table that maps said first message digest into said second message digest;
• creating a descriptor file that includes said first message digest and an identification of said mapping table;
• and
• creating a third message digest of said descriptor file and returning said third message digest to a user, whereby said user may use said third message digest to navigate forward through said content space formed by said first and second computer files.

A method of enabling forward navigation in a content space, said method comprising:

• receiving a first message digest that identifies a first computer file;
• receiving a second message digest that identifies a second computer file, said second computer file indicated as being a later version of said first computer file;
• creating a mapping table that maps said first message digest into said second message digest;
• returning said first message digest and an identification of said mapping table to a user;
• and
• indicating to said user that said first message digest and said mapping table enable forward navigation through said content space formed by said first and second computer files, whereby said user may invoke a session using said first message digest and said mapping table to forward navigate through said content space.

A method of enabling circular navigation in a content space, said method comprising:

• identifying first and second computer files, said first computer file including a second message digest that identifies said second computer file;
• creating a first message digest that identifies said first computer file;
• creating a version of said second computer file that includes said first message digest;
• creating a third message digest of said second computer file version;
• creating a mapping table that maps said second message digest into said third message digest;
• returning said first message digest and an identification of said mapping table to a user, whereby said user may navigate between said first and second computer files.