U

union (|) concatenation operator, 289

union simple type, 179

union types, RELAX NG, 218-219

uniqueness, attribute, 27

unordered() function, XPath, 288-289

unsignedByte/unsignedInt/unsignedLong/unsignedShort derived data types, 187

updatexml(), 344

URL table, 713

US-ASCII (English) character set, 23

use attribute, XML Schemas root document, 200

use cases, XQuery, 304

user input forms

Microsoft InfoPath

described, 750-754

XForms versus, 754-755

XForms

actions logic, 744-745

appearance, changing control, 733

children, common control, 731-732

clients, 755-756

controls, 727-730

described, 722-727

events logic, 743-744

grouping controls, 733-737

instance data, binding, 737-741

Microsoft InfoPath versus, 754-755

sample, 745-750

submit protocol, 741-743

XHTML, 721-722

user-defined functions, XQuery, 313-314

UTF-8 (Compressed Unicode) character set, 23

UTF-16 (Compressed UCS) character set, 23