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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 JSON format, set format=json.
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{
    "query": {
        "namespaces": {
            "-2": {
                "id": -2,
                "case": "first-letter",
                "*": "Medio",
                "canonical": "Media"
            },
            "-1": {
                "id": -1,
                "case": "first-letter",
                "*": "Especial",
                "canonical": "Special"
            },
            "0": {
                "id": 0,
                "case": "first-letter",
                "*": "",
                "content": ""
            },
            "1": {
                "id": 1,
                "case": "first-letter",
                "*": "Discusi\u00f3n",
                "subpages": "",
                "canonical": "Talk"
            },
            "2": {
                "id": 2,
                "case": "first-letter",
                "*": "Usuario",
                "subpages": "",
                "canonical": "User"
            },
            "3": {
                "id": 3,
                "case": "first-letter",
                "*": "Usuario discusi\u00f3n",
                "subpages": "",
                "canonical": "User talk"
            },
            "4": {
                "id": 4,
                "case": "first-letter",
                "*": "Encyclopaedia Herder",
                "subpages": "",
                "canonical": "Project"
            },
            "5": {
                "id": 5,
                "case": "first-letter",
                "*": "Encyclopaedia Herder discusi\u00f3n",
                "subpages": "",
                "canonical": "Project talk"
            },
            "6": {
                "id": 6,
                "case": "first-letter",
                "*": "Archivo",
                "canonical": "File"
            },
            "7": {
                "id": 7,
                "case": "first-letter",
                "*": "Archivo discusi\u00f3n",
                "subpages": "",
                "canonical": "File talk"
            },
            "8": {
                "id": 8,
                "case": "first-letter",
                "*": "MediaWiki",
                "subpages": "",
                "canonical": "MediaWiki"
            },
            "9": {
                "id": 9,
                "case": "first-letter",
                "*": "MediaWiki discusi\u00f3n",
                "subpages": "",
                "canonical": "MediaWiki talk"
            },
            "10": {
                "id": 10,
                "case": "first-letter",
                "*": "Plantilla",
                "canonical": "Template"
            },
            "11": {
                "id": 11,
                "case": "first-letter",
                "*": "Plantilla discusi\u00f3n",
                "subpages": "",
                "canonical": "Template talk"
            },
            "12": {
                "id": 12,
                "case": "first-letter",
                "*": "Ayuda",
                "subpages": "",
                "canonical": "Help"
            },
            "13": {
                "id": 13,
                "case": "first-letter",
                "*": "Ayuda discusi\u00f3n",
                "subpages": "",
                "canonical": "Help talk"
            },
            "14": {
                "id": 14,
                "case": "first-letter",
                "*": "Categor\u00eda",
                "canonical": "Category"
            },
            "15": {
                "id": 15,
                "case": "first-letter",
                "*": "Categor\u00eda discusi\u00f3n",
                "subpages": "",
                "canonical": "Category talk"
            },
            "200": {
                "id": 200,
                "case": "first-letter",
                "*": "Autor",
                "canonical": "Autor",
                "content": ""
            },
            "201": {
                "id": 201,
                "case": "first-letter",
                "*": "Autor Discusi\u00f3n",
                "canonical": "Autor Discusi\u00f3n"
            },
            "204": {
                "id": 204,
                "case": "first-letter",
                "*": "Recurso",
                "canonical": "Recurso",
                "content": ""
            },
            "205": {
                "id": 205,
                "case": "first-letter",
                "*": "Recurso Discusi\u00f3n",
                "canonical": "Recurso Discusi\u00f3n"
            },
            "206": {
                "id": 206,
                "case": "first-letter",
                "*": "Twiki",
                "canonical": "Twiki",
                "content": ""
            },
            "207": {
                "id": 207,
                "case": "first-letter",
                "*": "Twiki Discusi\u00f3n",
                "canonical": "Twiki Discusi\u00f3n"
            },
            "208": {
                "id": 208,
                "case": "first-letter",
                "*": "Brugger",
                "canonical": "Brugger",
                "content": ""
            },
            "209": {
                "id": 209,
                "case": "first-letter",
                "*": "Brugger Discusi\u00f3n",
                "canonical": "Brugger Discusi\u00f3n"
            },
            "210": {
                "id": 210,
                "case": "first-letter",
                "*": "Lugar",
                "canonical": "Lugar",
                "content": ""
            },
            "211": {
                "id": 211,
                "case": "first-letter",
                "*": "Lugar Discusi\u00f3n",
                "canonical": "Lugar Discusi\u00f3n"
            },
            "212": {
                "id": 212,
                "case": "first-letter",
                "*": "Bibliograf\u00eda",
                "canonical": "Bibliograf\u00eda",
                "content": ""
            },
            "213": {
                "id": 213,
                "case": "first-letter",
                "*": "Bibliograf\u00eda Discusi\u00f3n",
                "canonical": "Bibliograf\u00eda Discusi\u00f3n"
            },
            "214": {
                "id": 214,
                "case": "first-letter",
                "*": "Volpi",
                "canonical": "Volpi",
                "content": ""
            },
            "215": {
                "id": 215,
                "case": "first-letter",
                "*": "Volpi Discusi\u00f3n",
                "canonical": "Volpi Discusi\u00f3n"
            },
            "216": {
                "id": 216,
                "case": "first-letter",
                "*": "Lista",
                "canonical": "Lista"
            },
            "217": {
                "id": 217,
                "case": "first-letter",
                "*": "Lista Discusi\u00f3n",
                "canonical": "Lista Discusi\u00f3n"
            },
            "218": {
                "id": 218,
                "case": "first-letter",
                "*": "Comentario",
                "canonical": "Comentario",
                "content": ""
            },
            "219": {
                "id": 219,
                "case": "first-letter",
                "*": "Comentario Discusi\u00f3n",
                "canonical": "Comentario Discusi\u00f3n"
            },
            "220": {
                "id": 220,
                "case": "first-letter",
                "*": "Etiqueta",
                "canonical": "Etiqueta"
            },
            "221": {
                "id": 221,
                "case": "first-letter",
                "*": "Etiqueta Discusi\u00f3n",
                "canonical": "Etiqueta Discusi\u00f3n"
            },
            "222": {
                "id": 222,
                "case": "first-letter",
                "*": "Fonte",
                "canonical": "Fonte",
                "content": ""
            },
            "223": {
                "id": 223,
                "case": "first-letter",
                "*": "Fonte Discusi\u00f3n",
                "canonical": "Fonte Discusi\u00f3n"
            },
            "224": {
                "id": 224,
                "case": "first-letter",
                "*": "Menage",
                "canonical": "Menage",
                "content": ""
            },
            "225": {
                "id": 225,
                "case": "first-letter",
                "*": "Menage Discusi\u00f3n",
                "canonical": "Menage Discusi\u00f3n"
            },
            "226": {
                "id": 226,
                "case": "first-letter",
                "*": "Hillmann",
                "canonical": "Hillmann",
                "content": ""
            },
            "227": {
                "id": 227,
                "case": "first-letter",
                "*": "Hillmann Discusi\u00f3n",
                "canonical": "Hillmann Discusi\u00f3n"
            },
            "228": {
                "id": 228,
                "case": "first-letter",
                "*": "Gomperz",
                "canonical": "Gomperz",
                "content": ""
            },
            "229": {
                "id": 229,
                "case": "first-letter",
                "*": "Gomperz Discusi\u00f3n",
                "canonical": "Gomperz Discusi\u00f3n"
            },
            "230": {
                "id": 230,
                "case": "first-letter",
                "*": "Hirschberger",
                "canonical": "Hirschberger",
                "content": ""
            },
            "231": {
                "id": 231,
                "case": "first-letter",
                "*": "Hirschberger Discusi\u00f3n",
                "canonical": "Hirschberger Discusi\u00f3n"
            },
            "232": {
                "id": 232,
                "case": "first-letter",
                "*": "Chevalier",
                "canonical": "Chevalier",
                "content": ""
            },
            "233": {
                "id": 233,
                "case": "first-letter",
                "*": "Chevalier Discusi\u00f3n",
                "canonical": "Chevalier Discusi\u00f3n"
            },
            "234": {
                "id": 234,
                "case": "first-letter",
                "*": "Biblia",
                "canonical": "Biblia",
                "content": ""
            },
            "235": {
                "id": 235,
                "case": "first-letter",
                "*": "Biblia Discusi\u00f3n",
                "canonical": "Biblia Discusi\u00f3n"
            },
            "420": {
                "id": 420,
                "case": "first-letter",
                "*": "Layer",
                "canonical": "Layer"
            },
            "421": {
                "id": 421,
                "case": "first-letter",
                "*": "Layer talk",
                "canonical": "Layer talk"
            },
            "1002": {
                "id": 1002,
                "case": "first-letter",
                "*": "Atributo",
                "canonical": "Atributo"
            },
            "1003": {
                "id": 1003,
                "case": "first-letter",
                "*": "Atributo discusi\u00f3n",
                "subpages": "",
                "canonical": "Atributo discusi\u00f3n"
            },
            "1004": {
                "id": 1004,
                "case": "first-letter",
                "*": "Type",
                "canonical": "Type"
            },
            "1005": {
                "id": 1005,
                "case": "first-letter",
                "*": "Type talk",
                "subpages": "",
                "canonical": "Type talk"
            },
            "1006": {
                "id": 1006,
                "case": "first-letter",
                "*": "Formulario",
                "canonical": "Form"
            },
            "1007": {
                "id": 1007,
                "case": "first-letter",
                "*": "Discusi\u00f3n formulario",
                "subpages": "",
                "canonical": "Form talk"
            },
            "1008": {
                "id": 1008,
                "case": "first-letter",
                "*": "Concepto",
                "canonical": "Concepto"
            },
            "1009": {
                "id": 1009,
                "case": "first-letter",
                "*": "Concepto discusi\u00f3n",
                "subpages": "",
                "canonical": "Concepto discusi\u00f3n"
            }
        }
    }
}