[xsl] anyone can solve it

["Cheung Tin Po" <timothy298@xxxxxxxxxxx>]

hi expert,

i get an xml file like that
<record>
<row year="2000" month="1" thedata="xyx" />
<row year="2000" month="2" thedata="xyx" />
<row year="2000" month="3" thedata="xyx" />
<row year="2000" month="4" thedata="xyx" />
<row year="2000" month="5" thedata="xyx" />
<row year="2001" month="1" thedata="xyx" />
<row year="2000" month="3" thedata="xyx" />
<row year="2002" month="1" thedata="xyx" />
</record>

i want to use xsl the to trasform the output as html with the following 
result

2000 / 1  : xyx
      2  : xyx
      3  : xyx
2001 / 1  : xyx
      3  : xxx
...
      9  : sss
2002 / 1  : xxx
      2  : xxx


i want the year to show once only...  but i really dont know hoe to do that  
 as i dont know how to remember the value of year in the previous elements

> From Timothy






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