1. Research School of Computer Science, Australian National University, Canberra, Australia. E-mails: armin.haller@anu.edu.au, kerry.taylor@anu.edu.au
2. Geography Department, University of California, Santa Barbara, CA, USA. E-mail: jano@geog.ucsb.edu
3. Land and Water, CSIRO, Melbourne, Australia. E-mail: simon.cox@csiro.au
4. Univ Lyon, MINES Saint-Étienne, CNRS, Laboratoire Hubert Curien UMR 5516, Saint-Étienne, France. E-mail: maxime.lefrancois@emse.fr
5. Open Distributed Systems, Technische Universität Berlin, Germany. E-mail: danh.lephuoc@tu-berlin.de
6. Center for Geographic Analysis, Harvard University, Boston, MA, USA. E-mail: jlieberman@fas.harvard.edu
7. Ontology Engineering Group, Universidad Politécnica de Madrid, Madrid, Spain. E-mail: rgarcia@fi.upm.es
8. Metalinkage, Wollongong, Australia. E-mail: rob@metalinkage.com.au
9. Institut für Informatik, Universität Leipzig, Leipzig, Germany. E-mail: cstadler@informatik.uni-leipzig.de