Figure 1.

Universal Modelling Language (UML) class diagram showing the relationships between the main classes of data comprising a CWRML document. The diamond symbol at the end of a line indicates that the class at that end of the line aggregates data from the class(es) at the other end of the line. The small number at the end of a line indicates the allowed number of instances of the class at that end of the line per instance of the class at the other end of the line; 0..* indicates zero or more, 1..* indicates one or more.