A Lexical Metaschema for the UMLS Semantic Network Li Zhang, Yehoshua Perl, Michael Halper 2 , James Geller, George Hripcsak 3 Computer Science Dept. NJIT Newark, NJ 07102 {lxz1853, yehoshua.perl, james.geller}@njit.edu 2 Mathematics & Computer Science Dept. Kean University Union, NJ 07083 mhalper@kean.edu 3 Dept. of Medical Informatics Columbia University New York, NY 10032 hripcsak@columbia.edu Reprint requests & all communications to: Yehoshua Perl, Ph.D. yehoshua.perl@njit.edu CS Dept., NJIT NJIT, University Heights, Newark, 07102 phone: (973) 596-3392 fax: (973) 642-7029 1