18 April 2017  |  Archive The  Spatial Data on the Web Working Group  has published a Group Note of  QB4ST: RDF Data Cube extensions for spatio-temporal components . This document describes an extension to the existing RDF Data Cube ontology to support specification of key metadata required to interpret spatio-temporal data. The RDF Data Cube defines CodedProperties, which relate to a reference system based on a list of terms. QB4ST provides generalized support for numeric and other ordered references systems, particularly Spatial Reference Systems and Temporal Reference Systems.