1.	Limited set of baseline methods was selected
2.	Experiment setup is basic and not matching with the ideal situation. Why the experiments are performed separately for subtype/supertype and overlapping relations among entity types?
3.	Limited set of entity types is considered. Perhaps, that is the reason, even the basic X-Annot. method has similar performance as with other methods.
4. Manual intervention to get the final sets of entity types if relations among them exist. It may not be a good idea when entity types increase from 100s to 1000s.
4. Manual intervention to get the final sets of entity types if relations among them exist. It may not be a good idea when entity types increase from 100s to 1000s.