* to be published in the proceedings of the 22nd International
Conference on Knowledge Engineering and Knowledge Management (EKAW 2020) Access Paper or Ask Questions
* Revision from previous version: - Fixing flight companies in Figure 3
and changing some other details - Giving Figure 4 analogous data to Figure 3
for easier comparison - Updating discussion of the figures in Section 2.1.3.
- Updating Example B.6 to reflect the new Figure 4. - Minor formatting change
for Figure 27 Access Paper or Ask Questions