<bids>
<bid_tuple> 
<userid>U02</userid> 
<itemno>1001</itemno> 
<bid>35</bid> 
<bid_date>1999-01-07</bid_date> 
</bid_tuple> 
<bid_tuple> 
<userid>U04</userid> 
<itemno>1001</itemno> 
<bid>40</bid> 
<bid_date>1999-01-08</bid_date >
</bid_tuple> 
<bid_tuple> 
<userid>U02</userid> 
<itemno>1001</itemno> 
<bid>45</bid> 
<bid_date>1999-01-11</bid_date>
</bid_tuple> 
<bid_tuple> 
<userid>U04</userid> 
<itemno>1001</itemno> 
<bid>50</bid> 
<bid_date>1999-01-13</bid_date >
</bid_tuple> 
<bid_tuple> 
<userid>U02</userid> 
<itemno>1001</itemno> 
<bid>55</bid> 
<bid_date>1999-01-15</bid_date> 
</bid_tuple> 
<bid_tuple> 
<userid>U01</userid> 
<itemno>1002</itemno> 
<bid>400</bid> 
<bid_date>1999-02-14</bid_date> 
</bid_tuple> 
<bid_tuple> 
<userid>U02</userid> 
<itemno>1002</itemno> 
<bid>600</bid> 
<bid_date>1999-02-16</bid_date> 
</bid_tuple> 
<bid_tuple> 
<userid>U03</userid> 
<itemno>1002</itemno> 
<bid>800</bid> 
<bid_date>1999-02-17</bid_date> 
</bid_tuple> 
<bid_tuple> 
<userid>U04</userid> 
<itemno>1002</itemno> 
<bid>1000</bid> 
<bid_date>1999-02-25</bid_date> 
</bid_tuple> 
<bid_tuple> 
<userid>U02</userid> 
<itemno>1002</itemno> 
<bid>1200</bid> 
<bid_date>1999-03-02</bid_date> 
</bid_tuple> 
<bid_tuple> 
<userid>U04</userid> 
<itemno>1003</itemno> 
<bid>15</bid> 
<bid_date>1999-01-22</bid_date> 
</bid_tuple> 
<bid_tuple> 
<userid>U05</userid> 
<itemno>1003</itemno> 
<bid>20</bid> 
<bid_date>1999-02-03</bid_date >
</bid_tuple> 
<bid_tuple> 
<userid>U01</userid> 
<itemno>1004</itemno> 
<bid>40</bid> 
<bid_date>1999-03-05</bid_date> 
</bid_tuple> 
<bid_tuple> 
<userid>U03</userid> 
<itemno>1007</itemno> 
<bid>175</bid> 
<bid_date>1999-01-25</bid_date> 
</bid_tuple> 
<bid_tuple> 
<userid>U05</userid> 
<itemno>1007</itemno> 
<bid>200</bid> 
<bid_date>1999-02-08</bid_date> 
</bid_tuple> 
<bid_tuple> 
<userid>U04</userid> 
<itemno>1007</itemno> 
<bid>225</bid> 
<bid_date>1999-02-12</bid_date> 
</bid_tuple> 
</bids>


