Biomedical Linked Annotation Hackathon (BLAH) 1 was held in The University of Tokyo Kashiwa Campus Station Satellite in Kashiwa, Chiba, Japan. On the last day of the Hackathon (Feb. 27), public symposium of the BLAH 1 was held. In this talk, Larry Hunter (University of Colorado school of medicine) makes a presentation entitled "Principles for representing knowledge in and about texts". (33:20)