Validation, using InstanceCallbacks methods, 239
Variable string (query), 56
Variable types (query), 56
Vendor dependencies, 190
Vendor-specific information, from JDO implementation, 197
Vendor-specific work, construction and, 194
Vendor-supported query languages, 49
VendorName key, 197
verifyPersistence flag, 97
VersionNumber key, 197
view attributes command, 287
view book command, 287
view commands, 287, 295–296
VINs (for automobiles), 244