contrib_list            Getting the list of the contribution of a
                        contributor.
corpus_contrib_create   Creating a contributor corpus
corpus_contrib_data     Adding data to a contributor corpus
corpus_contrib_select   Selecting the member of a corpus, based on
                        their contributions.
corpus_page_create      Creating a page corpus
corpus_page_data        Adding page data to a page corpus
graph_page              Graph a wiki page
page_anon               Giving the proportion of anonmous contribution
                        in a revisions list
page_cat                List all categories where the page is located
page_infos              Getting some quantitative infos about a wiki
                        page
page_islink             Test if page(s) is(are) linked
page_links              List of inter-articles links on a wiki page
page_ranking            Extracting the first contributors freom a list
                        of revisions
page_revisions          Downloading the list of contributions for one
                        page
period                  Recode a date vector into periods
xpath                   Query a page by xpath means
