Another advantage of using DOI identifiers, as demonstrated by a student project was the ability to include them in interactive versions of journal tables and figures (Figure ). We had been experimenting with such objects for some years, 15 but the introduction of Handles and later DOIs allowed these tables to be constructed from data stored in a repository, to create for example rotatable models of molecules deriving from the calculations. During the period 2005-present, some 73 research articles were enhanced such tables and figures. 17