XHTML
HTML conversion, 11
output, specifying, 51
XML
Atom feed specification, 329
case sensitivity, 15
content namespace, 91
Del.icio.us, 282–283
document, defining, 322
DTD, valid referencing, 14–15
eBay API, 203–204
entities, 13–14
FedEx API
accepting returns, 196–198
canceling shipments, 192–193
limitations, 178
requesting rates, 183–185
shipping a package, 188–189
tracking packages, 193–196
feeds, prevalence of, 5
legal concerns, 10
namespaces, 34–35
opening and closing tags, 12–13
output, specifying, 51
security issues, 9–10
single root-level tag, 12
template
Atom, 321–322
RSS 0.91, 319–320
RSS 2.0, 320–321
terminology, 11–12
update frequency, 10–11
white space, remaining, 15
XML namespaces (XMLNS), 35
XMLNS (XML namespaces), 35
Xpath, 252–253
XSS (cross-site scripting attack), 9–10