V

validation, document , 1213 , 252

value indexes , 200 , 259

value() method, 169 , 189

VLDB (very large databases) , 382

vocabularies

application--specific, 387

document example, 391392

industry--specific, 387, 390

MathML (Mathematics XML), 387389

news feeds, 389

overview, 386

RSS (Really Simple Syndication), 390