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
                            [*] => Média
                            [canonical] => Media
                        )

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

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

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

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

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

                    [4] => Array
                        (
                            [id] => 4
                            [case] => first-letter
                            [*] => Projet
                            [subpages] => 
                            [canonical] => Project
                        )

                    [5] => Array
                        (
                            [id] => 5
                            [case] => first-letter
                            [*] => Discussion Projet
                            [subpages] => 
                            [canonical] => Project talk
                        )

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

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

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

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

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

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

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

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

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

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

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

                    [105] => Array
                        (
                            [id] => 105
                            [case] => first-letter
                            [*] => Discussion attribut
                            [subpages] => 
                            [canonical] => Discussion attribut
                        )

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

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

                    [108] => Array
                        (
                            [id] => 108
                            [case] => first-letter
                            [*] => Formulaire
                            [canonical] => Form
                        )

                    [109] => Array
                        (
                            [id] => 109
                            [case] => first-letter
                            [*] => Discussion formulaire
                            [subpages] => 
                            [canonical] => Form talk
                        )

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

                    [111] => Array
                        (
                            [id] => 111
                            [case] => first-letter
                            [*] => Discussion concept
                            [canonical] => Discussion concept
                        )

                    [112] => Array
                        (
                            [id] => 112
                            [case] => first-letter
                            [*] => Fiche
                            [subpages] => 
                            [canonical] => Fiche
                        )

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

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

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

                    [250] => Array
                        (
                            [id] => 250
                            [case] => first-letter
                            [*] => Page
                            [canonical] => Page
                        )

                    [251] => Array
                        (
                            [id] => 251
                            [case] => first-letter
                            [*] => Discussion Page
                            [canonical] => Page talk
                        )

                    [252] => Array
                        (
                            [id] => 252
                            [case] => first-letter
                            [*] => Livre
                            [canonical] => Index
                        )

                    [253] => Array
                        (
                            [id] => 253
                            [case] => first-letter
                            [*] => Discussion Livre
                            [canonical] => Index talk
                        )

                    [420] => Array
                        (
                            [id] => 420
                            [case] => first-letter
                            [*] => Layer
                            [canonical] => Layer
                        )

                    [421] => Array
                        (
                            [id] => 421
                            [case] => first-letter
                            [*] => Layer talk
                            [canonical] => Layer talk
                        )

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

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

                    [502] => Array
                        (
                            [id] => 502
                            [case] => first-letter
                            [*] => Private
                            [subpages] => 
                            [canonical] => Private
                        )

                    [503] => Array
                        (
                            [id] => 503
                            [case] => first-letter
                            [*] => Private talk
                            [subpages] => 
                            [canonical] => Private talk
                        )

                )

        )

)