$items[]=format_plural(count($uniques),t('Column <strong>!column</strong> is mandatory and considered unique: only one item per !column value will be created.',array('!column'=>implode(', ',$uniques))),t('Columns <strong>!columns</strong> are mandatory and values in these columns are considered unique: only one entry per value in one of these column will be created.',array('!columns'=>implode(', ',$uniques))));
$form['help']=array(
'list'=>array(
'#theme'=>'item_list',
'#items'=>$items,
),
);
$form['xpath']=array(
'#type'=>'textfield',
'#title'=>t('XPath Expression'),
'#description'=>t('The character that delimits fields in the CSV file.'),