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
                            [*] => Ежевика-Танах
                            [subpages] => 
                            [canonical] => Project
                        )

                    [5] => Array
                        (
                            [id] => 5
                            [case] => first-letter
                            [*] => Обсуждение Ежевика-Танах
                            [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
                        )

                    [500] => Array
                        (
                            [id] => 500
                            [case] => first-letter
                            [*] => ТАНАХ
                            [canonical] => ТАНАХ
                        )

                    [501] => Array
                        (
                            [id] => 501
                            [case] => first-letter
                            [*] => ТАНАХ talk
                            [canonical] => ТАНАХ talk
                        )

                    [510] => Array
                        (
                            [id] => 510
                            [case] => first-letter
                            [*] => СТИХ
                            [canonical] => СТИХ
                        )

                    [511] => Array
                        (
                            [id] => 511
                            [case] => first-letter
                            [*] => СТИХ talk
                            [canonical] => СТИХ talk
                        )

                    [520] => Array
                        (
                            [id] => 520
                            [case] => first-letter
                            [*] => КОММЕНТАРИИ
                            [canonical] => КОММЕНТАРИИ
                        )

                    [521] => Array
                        (
                            [id] => 521
                            [case] => first-letter
                            [*] => КОММЕНТАРИИ talk
                            [canonical] => КОММЕНТАРИИ talk
                        )

                    [522] => Array
                        (
                            [id] => 522
                            [case] => first-letter
                            [*] => COMMENTS
                            [canonical] => COMMENTS
                        )

                    [523] => Array
                        (
                            [id] => 523
                            [case] => first-letter
                            [*] => COMMENTS talk
                            [canonical] => COMMENTS talk
                        )

                    [530] => Array
                        (
                            [id] => 530
                            [case] => first-letter
                            [*] => ПЕРЕВОД
                            [canonical] => ПЕРЕВОД
                        )

                    [531] => Array
                        (
                            [id] => 531
                            [case] => first-letter
                            [*] => ПЕРЕВОД talk
                            [canonical] => ПЕРЕВОД talk
                        )

                    [540] => Array
                        (
                            [id] => 540
                            [case] => first-letter
                            [*] => ВНЕШНИЕ РЕСУРСЫ
                            [canonical] => ВНЕШНИЕ РЕСУРСЫ
                        )

                    [541] => Array
                        (
                            [id] => 541
                            [case] => first-letter
                            [*] => ВНЕШНИЕ РЕСУРСЫ talk
                            [canonical] => ВНЕШНИЕ РЕСУРСЫ talk
                        )

                    [542] => Array
                        (
                            [id] => 542
                            [case] => first-letter
                            [*] => EXTERNAL
                            [canonical] => EXTERNAL
                        )

                    [543] => Array
                        (
                            [id] => 543
                            [case] => first-letter
                            [*] => EXTERNAL talk
                            [canonical] => EXTERNAL talk
                        )

                    [550] => Array
                        (
                            [id] => 550
                            [case] => first-letter
                            [*] => АВТОРЫ
                            [canonical] => АВТОРЫ
                        )

                    [551] => Array
                        (
                            [id] => 551
                            [case] => first-letter
                            [*] => АВТОРЫ talk
                            [canonical] => АВТОРЫ talk
                        )

                    [552] => Array
                        (
                            [id] => 552
                            [case] => first-letter
                            [*] => AUTHORS
                            [canonical] => AUTHORS
                        )

                    [553] => Array
                        (
                            [id] => 553
                            [case] => first-letter
                            [*] => AUTHORS talk
                            [canonical] => AUTHORS talk
                        )

                    [560] => Array
                        (
                            [id] => 560
                            [case] => first-letter
                            [*] => СТАТЬИ
                            [canonical] => СТАТЬИ
                        )

                    [561] => Array
                        (
                            [id] => 561
                            [case] => first-letter
                            [*] => СТАТЬИ talk
                            [canonical] => СТАТЬИ talk
                        )

                    [570] => Array
                        (
                            [id] => 570
                            [case] => first-letter
                            [*] => TEMP
                            [canonical] => TEMP
                        )

                    [571] => Array
                        (
                            [id] => 571
                            [case] => first-letter
                            [*] => TEMP TALK
                            [canonical] => TEMP TALK
                        )

                )

        )

)