TSPI-conformant registered extensions that specify additional representations for spatial position, geographic location, and/or physical address. It is populated with initial high-value extensions, but is dynamically maintained on the MDR. Its use is conditional on the requirements of a given system/application and its accompanying business requirements. Point: A point as profiled from ISO 19136:2007 (GML) for use in the TSPI Schema but limited to the WGS84E_3D coordinate reference system and then extended to include both assessments of the accuracy and/or resolution of the coordinate tuple as well as optional specification of one or more character-oriented presentations of the coordinate tuple based on the sexagesimal, grid-metre, zone-metre, quadrangle and/or numeric-bit location forms. Point Type: A restricted point type as profiled from ISO 19136:2007 (GML) for use in the TSPI Schema but limited to the WGS84E_3D coordinate reference system and then extended to include both assessments of the accuracy and/or resolution of the coordinate tuple as well as optional specification of one or more character-oriented presentations of the coordinate tuple based on the sexagesimal, grid-metre, zone-metre, quadrangle and/or numeric-bit location forms. ... .... A property of the location instance.