PlaceTime.com - URIs for Places and Times by Ian Davis including:
- Instants in the Gregorian calendar
- A URI space that represents instants in time according to the Gregorian calendar.
- Intervals in the Gregorian calendar
- A URI space that represents intervals in time according to the Gregorian calendar.
- Points in the WGS 84 datum
- A URI space that represents geographical points in space according to the WGS 84 datum.