Implements hook_field_info().
function link_field_info() {
$types['link'] = array(
'label' => t('Link'),
'description' => t('Stores a URL string, optional varchar title, and optional blob of attributes to assemble a link.'),
'instance_settings' => array(
'title' => DRUPAL_OPTIONAL,
),
'default_widget' => 'link_default',
'default_formatter' => 'link',
);
return $types;
}