UDDI. See universal description, discovery, and integration
UML. See unified modeling language
UML-based tools, 238
UMLS. See Unified Medical Language System
UN/CEFACT, 233
unabridged dictionaries, 42, 43
unambiguous, 372
unary, 372
understanding and communicating meaning, 183-204
capturing the semantics, 183-188
concepts, 184-185
facts and relationships, 185-188
rules, 188
cataloging the semantics, 189-195
content management systems, 193
database do-it-yourself options, 190-192
dictionaries, 189-190
document management systems, 192-193
knowledge management systems, 193-194
lexical scope, 190
ontology editors, 194-195
formal methods and semantics, 201-202, 203
graphically oriented approaches, 195-199
entity relationship (ER) modeling, 198-199
requirements of a semantic graphic model, 195-198
unified modeling language (UML), 199-201
object role modeling (ORM), 200-201
Unicode, 335, 372
Unicode data, 216
Unicorn, 238
Unified Medical Language System (UMLS), 49, 56, 372
unified modeling language (UML), 82, 83, 93, 199-201, 372
unique, 372
United Census Bureau, "North American Industry Classification System" (NAICS), 34, 52-53
United States Defense Department, 267
United States Library of Congress, 109
United States Post Office, 245
universal adoption of extensible markup language (XML), 211-212
universal description, discovery, and integration (UDDI), 250, 299, 372
universal resource locators (URLs), 263, 300, 373
"universal truths," 179
unstructured data, 66, 373
"upper ontology," 57
URI (uniform resource identifier), 373
URLs. See universal resource locators
Uschold, Michael
"Enterprise Ontology, The," 185
Ontologies: Principles, Methods and Applications, 147
user, 373
user interfaces, 3-4
user interviews, 227-228