School of Informatics, The University of Edinburgh, Edinburgh, UK. seymour.kb@ed.ac.uk|School of Informatics, The University of Edinburgh, Edinburgh, UK. seymour.kb@ed.ac.uk|School of Informatics, The University of Edinburgh, Edinburgh, UK. seymour.kb@ed.ac.uk|School of Informatics, The University of Edinburgh, Edinburgh, UK. seymour.kb@ed.ac.uk