Index
Symbols and Numbers
* (asterisk), defining zones in DTD, 92
@ functionality, of Facebook and Twitter, 235–236
| (pipe), either/or definitions in DTD, 92
+ (plus), defining element in DTD, 92
<!---->, XML comment syntax, 101
? (question mark), defining zeros or single occurrences in DTD, 92
200 response code, in monitoring network activity, 217
2D graphics
OpenGL, 589
304 response code, in monitoring network activity, 217
3D graphics
HTML5, 75
OpenGL, 589
404 response code, in monitoring network activity, 217
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