Such organizations are IETF, OpenGIS, 3GPP, LIF, WAP Forum, W3C, etc. Each of them basically specifies its own way of providing and expressing location information to services and applications. This raises a serious problem - the various location information formats, services, and applications will not be interoperable in the Internet. Therefore, a common extendible way of expressing and transferring location information for services and applications in the Internet is needed. This work thus proposes a common format and extensible framework of expressing location information in the Internet.
Security is one of the key issues to be considered with the progress of the work.
In brief most of the formats express location with latitude, longitude, using WGS84 as reference datum. Some allow altitude, if the data is available. In the location expressions, altitude usually means the height above WGS84 reference ellipsoid, while it is unclear in some cases. In DNS-LOC and NVML radial size of object can be defined. When the accuracy for estimating a location is defined, it is mostly expressed as horizontal and vertical error.