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
(
    [warnings] => Array
        (
            [txtfm] => Array
                (
                    [*] => format=txtfm has been deprecated. Please use format=jsonfm instead.
                )

        )

    [query] => Array
        (
            [namespaces] => Array
                (
                    [-2] => Array
                        (
                            [id] => -2
                            [case] => first-letter
                            [*] => Media
                            [canonical] => Media
                        )

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

                    [550] => Array
                        (
                            [id] => 550
                            [case] => first-letter
                            [*] => Notes
                            [subpages] => 
                            [canonical] => Notes
                            [content] => 
                        )

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

                    [552] => Array
                        (
                            [id] => 552
                            [case] => first-letter
                            [*] => Books
                            [subpages] => 
                            [canonical] => Books
                            [content] => 
                        )

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

                    [554] => Array
                        (
                            [id] => 554
                            [case] => first-letter
                            [*] => Exercises
                            [subpages] => 
                            [canonical] => Exercises
                            [content] => 
                        )

                    [555] => Array
                        (
                            [id] => 555
                            [case] => first-letter
                            [*] => Exercises talk
                            [canonical] => Exercises talk
                        )

                    [556] => Array
                        (
                            [id] => 556
                            [case] => first-letter
                            [*] => Exams
                            [subpages] => 
                            [canonical] => Exams
                            [content] => 
                        )

                    [557] => Array
                        (
                            [id] => 557
                            [case] => first-letter
                            [*] => Exams talk
                            [canonical] => Exams talk
                        )

                    [558] => Array
                        (
                            [id] => 558
                            [case] => first-letter
                            [*] => Template data
                            [subpages] => 
                            [canonical] => Template data
                        )

                    [559] => Array
                        (
                            [id] => 559
                            [case] => first-letter
                            [*] => Template data talk
                            [canonical] => Template data talk
                        )

                    [560] => Array
                        (
                            [id] => 560
                            [case] => first-letter
                            [*] => LibSR
                            [subpages] => 
                            [canonical] => LibSR
                            [content] => 
                        )

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

                    [562] => Array
                        (
                            [id] => 562
                            [case] => first-letter
                            [*] => RealQ16s
                            [subpages] => 
                            [canonical] => RealQ16s
                        )

                    [563] => Array
                        (
                            [id] => 563
                            [case] => first-letter
                            [*] => RealQ16s talk
                            [canonical] => RealQ16s talk
                        )

                    [564] => Array
                        (
                            [id] => 564
                            [case] => first-letter
                            [*] => Site projects
                            [subpages] => 
                            [canonical] => Site projects
                            [content] => 
                        )

                    [565] => Array
                        (
                            [id] => 565
                            [case] => first-letter
                            [*] => Site projects talk
                            [canonical] => Site projects talk
                        )

                    [566] => Array
                        (
                            [id] => 566
                            [case] => first-letter
                            [*] => Site
                            [subpages] => 
                            [canonical] => Site
                            [content] => 
                        )

                    [567] => Array
                        (
                            [id] => 567
                            [case] => first-letter
                            [*] => Site talk
                            [canonical] => Site talk
                        )

                    [568] => Array
                        (
                            [id] => 568
                            [case] => first-letter
                            [*] => Lesson
                            [subpages] => 
                            [canonical] => Lesson
                            [content] => 
                        )

                    [569] => Array
                        (
                            [id] => 569
                            [case] => first-letter
                            [*] => Lesson talk
                            [canonical] => Lesson talk
                        )

                    [570] => Array
                        (
                            [id] => 570
                            [case] => first-letter
                            [*] => Example
                            [subpages] => 
                            [canonical] => Example
                            [content] => 
                        )

                    [571] => Array
                        (
                            [id] => 571
                            [case] => first-letter
                            [*] => Example talk
                            [canonical] => Example talk
                        )

                    [572] => Array
                        (
                            [id] => 572
                            [case] => first-letter
                            [*] => Task
                            [subpages] => 
                            [canonical] => Task
                            [content] => 
                        )

                    [573] => Array
                        (
                            [id] => 573
                            [case] => first-letter
                            [*] => Task talk
                            [canonical] => Task talk
                        )

                    [574] => Array
                        (
                            [id] => 574
                            [case] => first-letter
                            [*] => Motivation
                            [subpages] => 
                            [canonical] => Motivation
                            [content] => 
                        )

                    [575] => Array
                        (
                            [id] => 575
                            [case] => first-letter
                            [*] => Motivation talk
                            [canonical] => Motivation talk
                        )

                    [576] => Array
                        (
                            [id] => 576
                            [case] => first-letter
                            [*] => Doctrine
                            [subpages] => 
                            [canonical] => Doctrine
                            [content] => 
                        )

                    [577] => Array
                        (
                            [id] => 577
                            [case] => first-letter
                            [*] => Doctrine talk
                            [canonical] => Doctrine talk
                        )

                    [578] => Array
                        (
                            [id] => 578
                            [case] => first-letter
                            [*] => Discussion
                            [subpages] => 
                            [canonical] => Discussion
                            [content] => 
                        )

                    [579] => Array
                        (
                            [id] => 579
                            [case] => first-letter
                            [*] => Discussion talk
                            [canonical] => Discussion talk
                        )

                    [580] => Array
                        (
                            [id] => 580
                            [case] => first-letter
                            [*] => UTLOC
                            [subpages] => 
                            [canonical] => UTLOC
                            [content] => 
                        )

                    [581] => Array
                        (
                            [id] => 581
                            [case] => first-letter
                            [*] => UTLOC talk
                            [canonical] => UTLOC talk
                        )

                    [582] => Array
                        (
                            [id] => 582
                            [case] => first-letter
                            [*] => Notes archive
                            [subpages] => 
                            [canonical] => Notes archive
                            [content] => 
                        )

                    [583] => Array
                        (
                            [id] => 583
                            [case] => first-letter
                            [*] => Notes archive talk
                            [canonical] => Notes archive talk
                        )

                    [584] => Array
                        (
                            [id] => 584
                            [case] => first-letter
                            [*] => Experiment
                            [subpages] => 
                            [canonical] => Experiment
                            [content] => 
                        )

                    [585] => Array
                        (
                            [id] => 585
                            [case] => first-letter
                            [*] => Experiment talk
                            [canonical] => Experiment talk
                        )

                )

        )

)