delete a node

hi
how ca i delete the   empty element <xxx></xxx> from the following list:

<xxx></xxx>
<xxx>50</xxx>
 <xxx>40</xxx>
 <xxx>55</xxx>
 <xxx></xxx>
 <xxx>44</xxx>
 <xxx>555</xxx>
 <xxx>5554</xxx>
 <xxx></xxx>
 <xxx></xxx>


thanks


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