diplay data and page number

I am trying to get data from db and would like to display the bottom.
each row contains 4 products ( 4 cols) and if the row count is 4, then add one from the previous id...
if the row id is equal to 3 then...make another page number which is added one from the provious.
would you please help....

<page id="1">
      <row id="1" cols="4">
            <product product_id="1" />
            <product product_id="2" />
                        <product product_id="3" />
                        <product product_id="5" />
      </row>
      <row id="2" cols="4">
            <product product_id="7" />
            <product product_id="8" />
            <product product_id="9" />
            <product product_id="10" />
      </row>
      <row id="3" cols="4">
            <product product_id="11" />
            <product product_id="12" />
            <product product_id="13" />
            <product product_id="15" />
      </row>
</page>
<page id="2">
            <row id="4" cols="4">
            <product product_id="" />
            <product product_id="" />
            <product product_id="" />
            <product product_id="" />
      </row>
      <row id="5" cols="4">
            <product product_id="" />
            <product product_id="" />
            <product product_id="" />
            <product product_id="" />
      </row>
      <row id="6" cols="4">
            <product product_id="" />
            <product product_id="" />
            <product product_id="" />
            <product product_id="" />
      </row>

</page>
....
....
...
bbvicAsked:
Who is Participating?
 
Mayank SAssociate Director - Product EngineeringCommented:
>> if the row id is equal to 3 then...make another page number

You can create new pages based on multiples of 3:

if ( currentRowNnum % 3 == 0 )
{
  pageNumber ++ ;
  showNewPage () ;

}
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bbvicAuthor Commented:
using java, diplays like the above xml format...

caan you provide more detail code?
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Mayank SAssociate Director - Product EngineeringCommented:
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bbvicAuthor Commented:
using  java code, the below structure diplays like the above format

<page id="value1">
      <row id="value2" cols="value3">
            <product product_id="value4" />
            <product product_id="value5" />
                        <product product_id="value6" />
                        <product product_id="value7" />
      </row>
</page>

How can i create java code?
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CEHJCommented:
:-)
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