The conceptual schema in geospatial data standard design with application to GroundWaterML2 - Brodaric, Boyan; Boisvert, Eric; Dahlhaus, Peter; Grellet, Sylvain; Kmoch, Alexander; Letourneau, Francois; Lucido, Jessica; Simons, Bruce; Wagner, Bernhard (Open Geospatial Data, Software and Standards, 2018)