For example:
* Disabled toilet opened (01/01/2012). * Reports of graffiti from member of public (06/02/2012). * Opening hours changed to 8am - 8pm (14/02/2013).
The flow of events contain much more information than a few edited facts. It allows people to enter complete information without needing to agree a schema. The data on its own is useful without complex tools or UI.
* Postcode - EC1V 0AJ (01/05/2014) * GPS survey of entrypoint - 51.527411,-0.101689 (06/05/2014) * Ordnance Survey Toid linked - 156151456156 (01/05/2015) * Location logged on OpenStreetmap - entity ID 1561561561 (07/02/2015)
Of course having a schema and standards is better, but not actually essential. Parsable text is more useful than nothing at all.