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

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

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

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

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

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

                    [4] => Array
                        (
                            [id] => 4
                            [case] => first-letter
                            [*] => Casa Don Orione - Trebaseleghe
                            [canonical] => Project
                        )

                    [5] => Array
                        (
                            [id] => 5
                            [case] => first-letter
                            [*] => Discussioni Casa Don Orione - Trebaseleghe
                            [subpages] => 
                            [canonical] => Project talk
                        )

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

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

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

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

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

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

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

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

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

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

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

                    [103] => Array
                        (
                            [id] => 103
                            [case] => first-letter
                            [*] => Discussione proprietà
                            [subpages] => 
                            [canonical] => Discussione proprietà
                        )

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

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

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

                    [109] => Array
                        (
                            [id] => 109
                            [case] => first-letter
                            [*] => Discussione concetto
                            [canonical] => Discussione concetto
                        )

                    [170] => Array
                        (
                            [id] => 170
                            [case] => first-letter
                            [*] => Filter
                            [canonical] => Filter
                        )

                    [171] => Array
                        (
                            [id] => 171
                            [case] => first-letter
                            [*] => Filter talk
                            [subpages] => 
                            [canonical] => Filter talk
                        )

                    [200] => Array
                        (
                            [id] => 200
                            [case] => first-letter
                            [*] => UserWiki
                            [canonical] => UserWiki
                        )

                    [201] => Array
                        (
                            [id] => 201
                            [case] => first-letter
                            [*] => UserWiki talk
                            [canonical] => UserWiki talk
                        )

                    [202] => Array
                        (
                            [id] => 202
                            [case] => first-letter
                            [*] => User profile
                            [canonical] => User profile
                        )

                    [203] => Array
                        (
                            [id] => 203
                            [case] => first-letter
                            [*] => User profile talk
                            [canonical] => User profile talk
                        )

                    [210] => Array
                        (
                            [id] => 210
                            [case] => first-letter
                            [*] => Eventi
                            [subpages] => 
                            [canonical] => Eventi
                            [content] => 
                            [nonincludable] => 
                        )

                    [211] => Array
                        (
                            [id] => 211
                            [case] => first-letter
                            [*] => Discussione Eventi
                            [subpages] => 
                            [canonical] => Discussione Eventi
                            [content] => 
                            [nonincludable] => 
                        )

                    [212] => Array
                        (
                            [id] => 212
                            [case] => first-letter
                            [*] => Persone
                            [subpages] => 
                            [canonical] => Persone
                            [content] => 
                            [nonincludable] => 
                        )

                    [213] => Array
                        (
                            [id] => 213
                            [case] => first-letter
                            [*] => Discussione Persone
                            [subpages] => 
                            [canonical] => Discussione Persone
                            [content] => 
                            [nonincludable] => 
                        )

                    [214] => Array
                        (
                            [id] => 214
                            [case] => first-letter
                            [*] => Famiglie
                            [subpages] => 
                            [canonical] => Famiglie
                            [content] => 
                            [nonincludable] => 
                        )

                    [215] => Array
                        (
                            [id] => 215
                            [case] => first-letter
                            [*] => Discussione Famiglie
                            [subpages] => 
                            [canonical] => Discussione Famiglie
                            [content] => 
                            [nonincludable] => 
                        )

                    [216] => Array
                        (
                            [id] => 216
                            [case] => first-letter
                            [*] => Luoghi
                            [subpages] => 
                            [canonical] => Luoghi
                            [content] => 
                            [nonincludable] => 
                        )

                    [217] => Array
                        (
                            [id] => 217
                            [case] => first-letter
                            [*] => Discussione Luoghi
                            [subpages] => 
                            [canonical] => Discussione Luoghi
                            [content] => 
                            [nonincludable] => 
                        )

                    [218] => Array
                        (
                            [id] => 218
                            [case] => first-letter
                            [*] => Area Privata
                            [subpages] => 
                            [canonical] => Area Privata
                            [content] => 
                            [nonincludable] => 
                        )

                    [219] => Array
                        (
                            [id] => 219
                            [case] => first-letter
                            [*] => Discussione Area Privata
                            [subpages] => 
                            [canonical] => Discussione Area Privata
                            [content] => 
                            [nonincludable] => 
                        )

                    [220] => Array
                        (
                            [id] => 220
                            [case] => first-letter
                            [*] => Contatti
                            [subpages] => 
                            [canonical] => Contatti
                            [content] => 
                            [nonincludable] => 
                        )

                    [221] => Array
                        (
                            [id] => 221
                            [case] => first-letter
                            [*] => Discussione Contatti
                            [subpages] => 
                            [canonical] => Discussione Contatti
                            [content] => 
                            [nonincludable] => 
                        )

                    [222] => Array
                        (
                            [id] => 222
                            [case] => first-letter
                            [*] => Forms
                            [subpages] => 
                            [canonical] => Forms
                            [content] => 
                        )

                    [224] => Array
                        (
                            [id] => 224
                            [case] => first-letter
                            [*] => Artisti
                            [subpages] => 
                            [canonical] => Artisti
                            [content] => 
                            [nonincludable] => 
                        )

                    [225] => Array
                        (
                            [id] => 225
                            [case] => first-letter
                            [*] => Discussione Artisti
                            [subpages] => 
                            [canonical] => Discussione Artisti
                            [content] => 
                            [nonincludable] => 
                        )

                    [226] => Array
                        (
                            [id] => 226
                            [case] => first-letter
                            [*] => Ringraziamenti
                            [subpages] => 
                            [canonical] => Ringraziamenti
                            [content] => 
                            [nonincludable] => 
                        )

                    [227] => Array
                        (
                            [id] => 227
                            [case] => first-letter
                            [*] => Discussione Ringraziamenti
                            [subpages] => 
                            [canonical] => Discussione Ringraziamenti
                            [content] => 
                            [nonincludable] => 
                        )

                    [228] => Array
                        (
                            [id] => 228
                            [case] => first-letter
                            [*] => Pubblicazioni
                            [subpages] => 
                            [canonical] => Pubblicazioni
                            [content] => 
                            [nonincludable] => 
                        )

                    [229] => Array
                        (
                            [id] => 229
                            [case] => first-letter
                            [*] => Discussione Pubblicazioni
                            [subpages] => 
                            [canonical] => Discussione Pubblicazioni
                            [content] => 
                            [nonincludable] => 
                        )

                    [274] => Array
                        (
                            [id] => 274
                            [case] => first-letter
                            [*] => Widget
                            [canonical] => Widget
                        )

                    [275] => Array
                        (
                            [id] => 275
                            [case] => first-letter
                            [*] => Widget talk
                            [subpages] => 
                            [canonical] => Widget talk
                        )

                )

        )

)