Wikipedia data structure
Namespaces
Subject namespaces Talk namespaces
0 (Main/Article) Talk 1
2 User User talk 3
4 Wikipedia Wikipedia talk 5
6 File File talk 7
8 MediaWiki MediaWiki talk 9
10 Template Template talk 11
12 Help Help talk 13
14 Category Category talk 15
100 [[Wikipedia:Portal|]] 101
118 [[Wikipedia:Drafts|]] 119
710 TimedText TimedText talk 711
828 Module Module talk 829
Deprecated
2300 [[Wikipedia:Gadget|]] 2301
2302 [[Wikipedia:Gadget|]] 2303
Not installed
90 Thread Thread talk 91
92 Summary Summary talk 93
108 Book Book talk 109
442 Course Course talk 443
444 Institution Institution talk 445
446 Education Program Education Program talk 447
2600 Topic 2601
Virtual namespaces
-1 Special
-2 Media
Current list (API call)