Fig. 4

The representation of the n-ary relation pattern among patient, diagnosed tumor type, and date of diagnosis, where (a) illustrates how a patient A links to a breast cancer diagnosis, (b) is a graphical representation of the diagnosis relation contains not only the diagnosis "breast cancer" but also a timestamp for the date of diagnosis, (c) shows on the instance level how a patient A, her diagnosis of breast adenocarcinoma, and the diagnosis date are connected, and (d) shows how owl:Restriction is used to implement this n-ary relation