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ISBN: 978-972-8939-25-0 © 2010 IADISFigure 3. Proposed OWL DL graph for concepts, learning objects and their relationshipsFrom the ontology model, a graph structure was modeled (Figure 4) and the set of nodes and edges wasprocessed in order to determine all the paths in the graph starting from ‘energy’ node to ‘limit’ node using aBreadth First Search algorithm written in Python language. These paths were determined and a conceptdependence list (output list) below was obtained.Figure 4. Graph obtained from ontology information>>> find_all_paths(graph,'energy','limit')[['energy', 'force', 'mass', 'acceleration', 'velocity', 'deriv', 'limit'],['energy', 'force', 'mass', 'velocity', 'deriv', 'limit'],['energy', 'work', 'force', 'mass', 'acceleration', 'velocity', 'deriv','limit'],['energy', 'work', 'force', 'mass', 'velocity', 'deriv', 'limit']]>>>32