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

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

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

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

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

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

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

                    [5] => Array
                        (
                            [id] => 5
                            [case] => first-letter
                            [*] => Encyclopaedia Herder discusión
                            [subpages] => 
                            [canonical] => Project talk
                        )

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

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

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

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

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

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

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

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

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

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

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

                    [201] => Array
                        (
                            [id] => 201
                            [case] => first-letter
                            [*] => Autor Discusión
                            [canonical] => Autor Discusión
                        )

                    [204] => Array
                        (
                            [id] => 204
                            [case] => first-letter
                            [*] => Recurso
                            [canonical] => Recurso
                            [content] => 
                        )

                    [205] => Array
                        (
                            [id] => 205
                            [case] => first-letter
                            [*] => Recurso Discusión
                            [canonical] => Recurso Discusión
                        )

                    [206] => Array
                        (
                            [id] => 206
                            [case] => first-letter
                            [*] => Twiki
                            [canonical] => Twiki
                            [content] => 
                        )

                    [207] => Array
                        (
                            [id] => 207
                            [case] => first-letter
                            [*] => Twiki Discusión
                            [canonical] => Twiki Discusión
                        )

                    [208] => Array
                        (
                            [id] => 208
                            [case] => first-letter
                            [*] => Brugger
                            [canonical] => Brugger
                            [content] => 
                        )

                    [209] => Array
                        (
                            [id] => 209
                            [case] => first-letter
                            [*] => Brugger Discusión
                            [canonical] => Brugger Discusión
                        )

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

                    [211] => Array
                        (
                            [id] => 211
                            [case] => first-letter
                            [*] => Lugar Discusión
                            [canonical] => Lugar Discusión
                        )

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

                    [213] => Array
                        (
                            [id] => 213
                            [case] => first-letter
                            [*] => Bibliografía Discusión
                            [canonical] => Bibliografía Discusión
                        )

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

                    [215] => Array
                        (
                            [id] => 215
                            [case] => first-letter
                            [*] => Volpi Discusión
                            [canonical] => Volpi Discusión
                        )

                    [216] => Array
                        (
                            [id] => 216
                            [case] => first-letter
                            [*] => Lista
                            [canonical] => Lista
                        )

                    [217] => Array
                        (
                            [id] => 217
                            [case] => first-letter
                            [*] => Lista Discusión
                            [canonical] => Lista Discusión
                        )

                    [218] => Array
                        (
                            [id] => 218
                            [case] => first-letter
                            [*] => Comentario
                            [canonical] => Comentario
                            [content] => 
                        )

                    [219] => Array
                        (
                            [id] => 219
                            [case] => first-letter
                            [*] => Comentario Discusión
                            [canonical] => Comentario Discusión
                        )

                    [220] => Array
                        (
                            [id] => 220
                            [case] => first-letter
                            [*] => Etiqueta
                            [canonical] => Etiqueta
                        )

                    [221] => Array
                        (
                            [id] => 221
                            [case] => first-letter
                            [*] => Etiqueta Discusión
                            [canonical] => Etiqueta Discusión
                        )

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

                    [223] => Array
                        (
                            [id] => 223
                            [case] => first-letter
                            [*] => Fonte Discusión
                            [canonical] => Fonte Discusión
                        )

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

                    [225] => Array
                        (
                            [id] => 225
                            [case] => first-letter
                            [*] => Menage Discusión
                            [canonical] => Menage Discusión
                        )

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

                    [227] => Array
                        (
                            [id] => 227
                            [case] => first-letter
                            [*] => Hillmann Discusión
                            [canonical] => Hillmann Discusión
                        )

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

                    [229] => Array
                        (
                            [id] => 229
                            [case] => first-letter
                            [*] => Gomperz Discusión
                            [canonical] => Gomperz Discusión
                        )

                    [230] => Array
                        (
                            [id] => 230
                            [case] => first-letter
                            [*] => Hirschberger
                            [canonical] => Hirschberger
                            [content] => 
                        )

                    [231] => Array
                        (
                            [id] => 231
                            [case] => first-letter
                            [*] => Hirschberger Discusión
                            [canonical] => Hirschberger Discusión
                        )

                    [232] => Array
                        (
                            [id] => 232
                            [case] => first-letter
                            [*] => Chevalier
                            [canonical] => Chevalier
                            [content] => 
                        )

                    [233] => Array
                        (
                            [id] => 233
                            [case] => first-letter
                            [*] => Chevalier Discusión
                            [canonical] => Chevalier Discusión
                        )

                    [234] => Array
                        (
                            [id] => 234
                            [case] => first-letter
                            [*] => Biblia
                            [canonical] => Biblia
                            [content] => 
                        )

                    [235] => Array
                        (
                            [id] => 235
                            [case] => first-letter
                            [*] => Biblia Discusión
                            [canonical] => Biblia Discusión
                        )

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

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

                    [1002] => Array
                        (
                            [id] => 1002
                            [case] => first-letter
                            [*] => Atributo
                            [canonical] => Atributo
                        )

                    [1003] => Array
                        (
                            [id] => 1003
                            [case] => first-letter
                            [*] => Atributo discusión
                            [subpages] => 
                            [canonical] => Atributo discusión
                        )

                    [1004] => Array
                        (
                            [id] => 1004
                            [case] => first-letter
                            [*] => Type
                            [canonical] => Type
                        )

                    [1005] => Array
                        (
                            [id] => 1005
                            [case] => first-letter
                            [*] => Type talk
                            [subpages] => 
                            [canonical] => Type talk
                        )

                    [1006] => Array
                        (
                            [id] => 1006
                            [case] => first-letter
                            [*] => Formulario
                            [canonical] => Form
                        )

                    [1007] => Array
                        (
                            [id] => 1007
                            [case] => first-letter
                            [*] => Discusión formulario
                            [subpages] => 
                            [canonical] => Form talk
                        )

                    [1008] => Array
                        (
                            [id] => 1008
                            [case] => first-letter
                            [*] => Concepto
                            [canonical] => Concepto
                        )

                    [1009] => Array
                        (
                            [id] => 1009
                            [case] => first-letter
                            [*] => Concepto discusión
                            [subpages] => 
                            [canonical] => Concepto discusión
                        )

                )

        )

)