In a previous implementation of Contextualise I included the ability to timestamp topics allowing for a straight-forward temporal navigation of topics using a timeline component. It was somewhat naive, but it did allow you to navigate a knowledge graph from a time perspective. This time around I probably wouldn't add the timestamp directly to the topic but instead tackle this by means of temporal relationships using, obviously, associations. The outcome would be (regardless of how it is actually modeled in the topic map) is that a timeline component could be appropriately populated allowing for temporal navigation of a knowledge graph.