how to add into xmlfeed into product Keywords please

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i have prestashop 1.3.x.x

I create php for generate xml feed, every works good now I must only add last thing.

 

I must have in product Keywords. But i dont know what i must write for keywords please anyone help me with this

 

now is in my php for generating xml this:

<PRODUCT>
<NAME>'.str_replace("&", "and", strip_tags($row['name'])).'</NAME>
<KEYWORDS> ???????? </KEYWORDS>
<DESCRIPTION>'.str_replace("&", "&",strip_tags($row['description_short'])).'</DESCRIPTION>
<SKU>'.$row['id_product'].'</SKU>
<BUYURL>'.$row['link'].'</BUYURL>
<AVAILABLE>YES</AVAILABLE>
<IMAGEURL>http://mywebsite/img/p/'.$row['id_product'].'-'.$img['id_image'].'.jpg</IMAGEURL>
<PRICE>'.($row['price']*1).'</PRICE>
<CURRENCY>EUR</CURRENCY>
<UPC>'.($row['ean13']).'</UPC>
<MANUFACTURER>'.htmlspecialchars($row['manufacturer_name']).'</MANUFACTURER>
</PRODUCT>';

Edited August 22, 2013 by MPart (see edit history)