You are looking at the HTML representation of the TXT format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the TXT format, set format=txt.
See the complete documentation, or API help for more information.
Array
(
    [query] => Array
        (
            [namespaces] => Array
                (
                    [-2] => Array
                        (
                            [id] => -2
                            [case] => first-letter
                            [*] => Медиа
                            [canonical] => Media
                        )

                    [-1] => Array
                        (
                            [id] => -1
                            [case] => first-letter
                            [*] => Служебная
                            [canonical] => Special
                        )

                    [0] => Array
                        (
                            [id] => 0
                            [case] => first-letter
                            [*] => 
                            [content] => 
                        )

                    [1] => Array
                        (
                            [id] => 1
                            [case] => first-letter
                            [*] => Обсуждение
                            [subpages] => 
                            [canonical] => Talk
                        )

                    [2] => Array
                        (
                            [id] => 2
                            [case] => first-letter
                            [*] => Участник
                            [subpages] => 
                            [canonical] => User
                        )

                    [3] => Array
                        (
                            [id] => 3
                            [case] => first-letter
                            [*] => Обсуждение участника
                            [subpages] => 
                            [canonical] => User talk
                        )

                    [4] => Array
                        (
                            [id] => 4
                            [case] => first-letter
                            [*] => wiki.standart-n.ru
                            [subpages] => 
                            [canonical] => Project
                        )

                    [5] => Array
                        (
                            [id] => 5
                            [case] => first-letter
                            [*] => Обсуждение wiki.standart-n.ru
                            [subpages] => 
                            [canonical] => Project talk
                        )

                    [6] => Array
                        (
                            [id] => 6
                            [case] => first-letter
                            [*] => Файл
                            [canonical] => File
                        )

                    [7] => Array
                        (
                            [id] => 7
                            [case] => first-letter
                            [*] => Обсуждение файла
                            [subpages] => 
                            [canonical] => File talk
                        )

                    [8] => Array
                        (
                            [id] => 8
                            [case] => first-letter
                            [*] => MediaWiki
                            [subpages] => 
                            [canonical] => MediaWiki
                        )

                    [9] => Array
                        (
                            [id] => 9
                            [case] => first-letter
                            [*] => Обсуждение MediaWiki
                            [subpages] => 
                            [canonical] => MediaWiki talk
                        )

                    [10] => Array
                        (
                            [id] => 10
                            [case] => first-letter
                            [*] => Шаблон
                            [canonical] => Template
                        )

                    [11] => Array
                        (
                            [id] => 11
                            [case] => first-letter
                            [*] => Обсуждение шаблона
                            [subpages] => 
                            [canonical] => Template talk
                        )

                    [12] => Array
                        (
                            [id] => 12
                            [case] => first-letter
                            [*] => Справка
                            [subpages] => 
                            [canonical] => Help
                        )

                    [13] => Array
                        (
                            [id] => 13
                            [case] => first-letter
                            [*] => Обсуждение справки
                            [subpages] => 
                            [canonical] => Help talk
                        )

                    [14] => Array
                        (
                            [id] => 14
                            [case] => first-letter
                            [*] => Категория
                            [canonical] => Category
                        )

                    [15] => Array
                        (
                            [id] => 15
                            [case] => first-letter
                            [*] => Обсуждение категории
                            [subpages] => 
                            [canonical] => Category talk
                        )

                    [100] => Array
                        (
                            [id] => 100
                            [case] => first-letter
                            [*] => Help
                            [canonical] => Help
                            [nonincludable] => 
                        )

                    [101] => Array
                        (
                            [id] => 101
                            [case] => first-letter
                            [*] => Help talk
                            [canonical] => Help talk
                            [nonincludable] => 
                        )

                    [102] => Array
                        (
                            [id] => 102
                            [case] => first-letter
                            [*] => Problems
                            [canonical] => Problems
                            [nonincludable] => 
                        )

                    [103] => Array
                        (
                            [id] => 103
                            [case] => first-letter
                            [*] => Problems talk
                            [canonical] => Problems talk
                            [nonincludable] => 
                        )

                    [104] => Array
                        (
                            [id] => 104
                            [case] => first-letter
                            [*] => Clients
                            [canonical] => Clients
                            [nonincludable] => 
                        )

                    [105] => Array
                        (
                            [id] => 105
                            [case] => first-letter
                            [*] => Clients talk
                            [canonical] => Clients talk
                            [nonincludable] => 
                        )

                    [106] => Array
                        (
                            [id] => 106
                            [case] => first-letter
                            [*] => Reglament
                            [canonical] => Reglament
                            [nonincludable] => 
                        )

                    [107] => Array
                        (
                            [id] => 107
                            [case] => first-letter
                            [*] => Reglament talk
                            [canonical] => Reglament talk
                            [nonincludable] => 
                        )

                    [108] => Array
                        (
                            [id] => 108
                            [case] => first-letter
                            [*] => Duty
                            [canonical] => Duty
                            [nonincludable] => 
                        )

                    [109] => Array
                        (
                            [id] => 109
                            [case] => first-letter
                            [*] => Duty talk
                            [canonical] => Duty talk
                            [nonincludable] => 
                        )

                    [110] => Array
                        (
                            [id] => 110
                            [case] => first-letter
                            [*] => Contacts
                            [canonical] => Contacts
                            [nonincludable] => 
                        )

                    [111] => Array
                        (
                            [id] => 111
                            [case] => first-letter
                            [*] => Contacts talk
                            [canonical] => Contacts talk
                            [nonincludable] => 
                        )

                    [112] => Array
                        (
                            [id] => 112
                            [case] => first-letter
                            [*] => Versions
                            [canonical] => Versions
                            [nonincludable] => 
                        )

                    [113] => Array
                        (
                            [id] => 113
                            [case] => first-letter
                            [*] => Versions talk
                            [canonical] => Versions talk
                            [nonincludable] => 
                        )

                    [114] => Array
                        (
                            [id] => 114
                            [case] => first-letter
                            [*] => Econv
                            [canonical] => Econv
                            [nonincludable] => 
                        )

                    [115] => Array
                        (
                            [id] => 115
                            [case] => first-letter
                            [*] => Econv talk
                            [canonical] => Econv talk
                            [nonincludable] => 
                        )

                    [116] => Array
                        (
                            [id] => 116
                            [case] => first-letter
                            [*] => Vnedrenie
                            [canonical] => Vnedrenie
                            [nonincludable] => 
                        )

                    [117] => Array
                        (
                            [id] => 117
                            [case] => first-letter
                            [*] => Vnedrenie talk
                            [canonical] => Vnedrenie talk
                            [nonincludable] => 
                        )

                    [118] => Array
                        (
                            [id] => 118
                            [case] => first-letter
                            [*] => Managers
                            [canonical] => Managers
                            [nonincludable] => 
                        )

                    [119] => Array
                        (
                            [id] => 119
                            [case] => first-letter
                            [*] => Managers talk
                            [canonical] => Managers talk
                            [nonincludable] => 
                        )

                    [120] => Array
                        (
                            [id] => 120
                            [case] => first-letter
                            [*] => SysAdmin
                            [canonical] => SysAdmin
                            [nonincludable] => 
                        )

                    [121] => Array
                        (
                            [id] => 121
                            [case] => first-letter
                            [*] => SysAdmin talk
                            [canonical] => SysAdmin talk
                            [nonincludable] => 
                        )

                    [122] => Array
                        (
                            [id] => 122
                            [case] => first-letter
                            [*] => Developers
                            [canonical] => Developers
                            [nonincludable] => 
                        )

                    [123] => Array
                        (
                            [id] => 123
                            [case] => first-letter
                            [*] => Developers talk
                            [canonical] => Developers talk
                            [nonincludable] => 
                        )

                )

        )

)