1. Botts, M.: OpenGIS Sensor Model Language (SensorML) implementation specification, version 1.0.0. Tech. Rep. 07-00, Open Geospatial Consortium (2007)
2. Botts, M., Percivall, G., Reed, C., Davidson, J.: OGC white paper - OGC Sensor Web Enablement: Overview and high level architecture. Tech. Rep. 07-165, Open Geospatial Consortium (2007)
3. Cox, S.: Observations and Measurements - part 1- observation schema version 1.0. Tech. Rep. 07-022r1, Open Geospatial Consortium (2007)
4. Fitzner, D., Hoffmann, J., Klien, E.: Functional description of geoprocessing services as conjunctive datalog queries. Geoinformatica (2009) (currently under review)
5. Gangemi, A., Guarino, N., Masolo, C., Oltramari, A.: Sweetening WordNet with DOLCE. AI Magazine 24(3), 13–24 (2003)