Base types form the AddressStandard Federal Geographic Data Committee FGDC Document Number FGDC-STD-016-2011 United States Thoroughfare, Landmark, and Postal Address Data Standard 468 A description of what a given set of address coordinates represent along with the coordinates themselves. This could be the position of coordinate or the point of collection of the coordinate. In GML, a Point is defined by a single coordinate tuple. A tuple is a way of storing multiple values in a single value The direct position of a point is specified by the pos element which is of type DirectPositionType. A description of the position the coordinates represent. Such descriptions could be "Front Door", "Parcel Centroid", "Building Centroid", "Driveway" amongst others.