An effort has been made to keep nodes small, confined to a single idea. Nodes are connected to other nodes in the document via both contextual and non-contextual links. A node on the organization and navigation of the document further explores this idea. Links are items in a node which may be activated to access another node. In typical graphical browsers, links are identified by underlined text in a different color from the base text and are activated by clicking on them.
Contextual links occur within the presentation of the text or content of the node, hence the name.
Because they occur outside the presentation of the node, they are called non-contextual links.