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How to alter add content form to include a new setting panel?

Here is the code for creating a new Tab in the settings panel on “Add article” node. But it is not displaying.. what could be the errors ?

function mltag_form_alter(&$form, &$form_state, $form_id) { if ($form_id == 'article_node_form') { drupal_set_message('Editing a node'); $form['mltag'] = array(     '#type' => 'fieldset',     '#title' => t('MLTag settings'),     '#access' => TRUE,     '#collapsible' => TRUE,     '#group' => 'additional_settings',     //'#attached' => array(     //        'js' => array(drupal_get_path('module', 'autordf').'/autordf.js'),     //),     '#tree' => TRUE,     '#weight' => -2,     '#attributes' => array('class' => array('mltag-settings')), ); $form['mltag']['enabled'] = array(     '#type' => 'checkbox',     '#title' => t('Generate tags use Mltag'),     //'#default_value' => (empty($form['nid']['#value'])), ); }    }
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How to alter add content form to include a new setting panel?

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