You are looking at the HTML representation of the TXT format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information.
Array
(
    [query] => Array
        (
            [namespaces] => Array
                (
                    [-2] => Array
                        (
                            [id] => -2
                            [*] => Media
                        )

                    [-1] => Array
                        (
                            [id] => -1
                            [*] => Special
                        )

                    [SF_NS_FORM] => Array
                        (
                            [id] => SF_NS_FORM
                            [*] => Form
                        )

                    [SF_NS_FORM_TALK] => Array
                        (
                            [id] => SF_NS_FORM_TALK
                            [*] => Form talk
                        )

                    [0] => Array
                        (
                            [id] => 0
                            [*] => 
                        )

                    [1] => Array
                        (
                            [id] => 1
                            [*] => Talk
                        )

                    [2] => Array
                        (
                            [id] => 2
                            [*] => User
                        )

                    [3] => Array
                        (
                            [id] => 3
                            [*] => User talk
                        )

                    [4] => Array
                        (
                            [id] => 4
                            [*] => PCSAR
                        )

                    [5] => Array
                        (
                            [id] => 5
                            [*] => PCSAR talk
                        )

                    [6] => Array
                        (
                            [id] => 6
                            [*] => Image
                        )

                    [7] => Array
                        (
                            [id] => 7
                            [*] => Image talk
                        )

                    [8] => Array
                        (
                            [id] => 8
                            [*] => MediaWiki
                        )

                    [9] => Array
                        (
                            [id] => 9
                            [*] => MediaWiki talk
                        )

                    [10] => Array
                        (
                            [id] => 10
                            [*] => Template
                        )

                    [11] => Array
                        (
                            [id] => 11
                            [*] => Template talk
                        )

                    [12] => Array
                        (
                            [id] => 12
                            [*] => Help
                        )

                    [13] => Array
                        (
                            [id] => 13
                            [*] => Help talk
                        )

                    [14] => Array
                        (
                            [id] => 14
                            [*] => Category
                        )

                    [15] => Array
                        (
                            [id] => 15
                            [*] => Category talk
                        )

                    [100] => Array
                        (
                            [id] => 100
                            [*] => Members
                        )

                    [101] => Array
                        (
                            [id] => 101
                            [*] => Members Talk
                        )

                    [102] => Array
                        (
                            [id] => 102
                            [*] => Rope
                        )

                    [103] => Array
                        (
                            [id] => 103
                            [*] => Rope Talk
                        )

                    [104] => Array
                        (
                            [id] => 104
                            [*] => I20110907
                        )

                    [105] => Array
                        (
                            [id] => 105
                            [*] => I20110907 Talk
                        )

                    [300] => Array
                        (
                            [id] => 300
                            [*] => Relation
                        )

                    [301] => Array
                        (
                            [id] => 301
                            [*] => Relation talk
                        )

                    [302] => Array
                        (
                            [id] => 302
                            [*] => Property
                        )

                    [303] => Array
                        (
                            [id] => 303
                            [*] => Property talk
                        )

                    [304] => Array
                        (
                            [id] => 304
                            [*] => Type
                        )

                    [305] => Array
                        (
                            [id] => 305
                            [*] => Type talk
                        )

                    [308] => Array
                        (
                            [id] => 308
                            [*] => Concept
                        )

                    [309] => Array
                        (
                            [id] => 309
                            [*] => Concept talk
                        )

                )

        )

)