2013-09-04 2013-11-12 IETF Review urn:ietf:params:geopriv:relative:2d A two-dimensional relative coordinate reference system IETF, GEOPRIV working group (geopriv&ietf.org), Martin Thomson (martin.thomson&gmail.com). N/A urn:ietf:params:geopriv:relative:3d A three-dimensional relative coordinate reference system IETF, GEOPRIV working group (geopriv&ietf.org), Martin Thomson (martin.thomson&gmail.com). N/A