Support for any given sub-topic obtains from CMs adding structures to the topic. Once such structure is the topic object described before. Adding topic objects to the sub-topic set of a topic indicates interest and support for the parent node.
But topics alone do not define the knowledge space of a subject. CMs may also support a topic by adding additional types of objects to the appropriate sets in the topic object. In Figure 2, above, there are four additional sets containing object types: issues, comments, proposals, and a user-defined type.