1. Department of Computer Science, Indiana University, 215 Lindley Hall, 150 S. Woodlawn, Bloomington, Indiana 47405, Department of Computer Science, State University of New York at Binghamton (SUNY), P.O. Box 6000, Binghamton, New York 13902, The Knowledge Acquisition and Projection Lab of The Pervasive Technology Labs at Indiana University, 501 N. Morton St. Bloomington, Indiana 47404, and School of Informatics, Indiana University, 901 E. 10th St., Bloomington, Indiana 47408