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Please see "format" parameter documentation at the API help
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<?xml version="1.0" encoding="utf-8"?><wddxPacket version="1.0"><header/><data><struct><var name="query"><struct><var name="namespaces"><struct><var name="-2"><struct><var name="id"><number>-2</number></var><var name="*"><string>Media</string></var></struct></var><var name="-1"><struct><var name="id"><number>-1</number></var><var name="*"><string>Special</string></var></struct></var><var name="0"><struct><var name="id"><number>0</number></var><var name="*"><string /></var></struct></var><var name="1"><struct><var name="id"><number>1</number></var><var name="*"><string>Talk</string></var></struct></var><var name="2"><struct><var name="id"><number>2</number></var><var name="*"><string>User</string></var></struct></var><var name="3"><struct><var name="id"><number>3</number></var><var name="*"><string>User talk</string></var></struct></var><var name="4"><struct><var name="id"><number>4</number></var><var name="*"><string>CaseWiki</string></var></struct></var><var name="5"><struct><var name="id"><number>5</number></var><var name="*"><string>CaseWiki talk</string></var></struct></var><var name="6"><struct><var name="id"><number>6</number></var><var name="*"><string>Image</string></var></struct></var><var name="7"><struct><var name="id"><number>7</number></var><var name="*"><string>Image talk</string></var></struct></var><var name="8"><struct><var name="id"><number>8</number></var><var name="*"><string>MediaWiki</string></var></struct></var><var name="9"><struct><var name="id"><number>9</number></var><var name="*"><string>MediaWiki talk</string></var></struct></var><var name="10"><struct><var name="id"><number>10</number></var><var name="*"><string>Template</string></var></struct></var><var name="11"><struct><var name="id"><number>11</number></var><var name="*"><string>Template talk</string></var></struct></var><var name="12"><struct><var name="id"><number>12</number></var><var name="*"><string>Help</string></var></struct></var><var name="13"><struct><var name="id"><number>13</number></var><var name="*"><string>Help talk</string></var></struct></var><var name="14"><struct><var name="id"><number>14</number></var><var name="*"><string>Category</string></var></struct></var><var name="15"><struct><var name="id"><number>15</number></var><var name="*"><string>Category talk</string></var></struct></var><var name="100"><struct><var name="id"><number>100</number></var><var name="*"><string>Metadata</string></var></struct></var><var name="101"><struct><var name="id"><number>101</number></var><var name="*"><string>Metadata Talk</string></var></struct></var><var name="102"><struct><var name="id"><number>102</number></var><var name="*"><string>Graphviz</string></var></struct></var><var name="103"><struct><var name="id"><number>103</number></var><var name="*"><string>Graphviz Talk</string></var></struct></var><var name="106"><struct><var name="id"><number>106</number></var><var name="*"><string>Event</string></var></struct></var><var name="107"><struct><var name="id"><number>107</number></var><var name="*"><string>Event Talk</string></var></struct></var><var name="108"><struct><var name="id"><number>108</number></var><var name="*"><string>Course</string></var></struct></var><var name="109"><struct><var name="id"><number>109</number></var><var name="*"><string>Course Talk</string></var></struct></var><var name="200"><struct><var name="id"><number>200</number></var><var name="*"><string>Relation</string></var></struct></var><var name="201"><struct><var name="id"><number>201</number></var><var name="*"><string>Relation talk</string></var></struct></var><var name="202"><struct><var name="id"><number>202</number></var><var name="*"><string>Attribute</string></var></struct></var><var name="203"><struct><var name="id"><number>203</number></var><var name="*"><string>Attribute talk</string></var></struct></var><var name="204"><struct><var name="id"><number>204</number></var><var name="*"><string>Type</string></var></struct></var><var name="205"><struct><var name="id"><number>205</number></var><var name="*"><string>Type talk</string></var></struct></var></struct></var></struct></var></struct></data></wddxPacket>