Although the project focussed on only a few selected classes, many of the other areas listed above were considered in detail. In some cases the topic area suggested has been captured in the broad structure (e.g. 'settings' have been included among the toplevel classes). In other cases, the topic area has been built into the public health classification as attributes and characteristics of classes. Some are demonstrated in the examples of practical applications in Section 3.2.4. For instance, stakeholders and population groups are shown as attributes (slots) of 'public health activities' in Example 1. 'Policy' has been represented as a register or library of existing policies in Example 2. 'Research' should be identifiable through classification using the 'methods' class (which includes the subclass 'research and evaluation methods'). 'Workforce' and 'workforce development capacity' have been included as subclasses of the 'resources and infrastructure' class, as has 'time'.