The 
                  toc element represents a single table of contents in a document.
                  
               
The 
                  Section variant is an adaption for use when a table of contents represents a unique section of a work, such as the primary table
                  of contents in the front matter of a book.
                  
               
The term "table of contents" is a generalization encompassing all of tables of contents, tables of figures, tables of maps and similar guides to the contents of a document.