use XSLT to create cross-reference table!

[wxdqz]

Hi,Suppose I have the following XML file:<Data><ITEM ROW="R1" COL="C1">1</ITEM><ITEM ROW="R2" COL="C1">2</ITEM><ITEM ROW="R3" COL="C1">3</ITEM><ITEM ROW="R1" COL="C2">4</ITEM><ITEM ROW="R2" COL="C3">5</ITEM><ITEM ROW="R4" COL="C4">6</ITEM><Data>How can I use XSLT to change it into the following style:<TABLE><THEAD><TH></TH><TH>C1</TH><TH>C2</TH><TH>C3</TH><TH>C4</TH></THEAD><TBODY><TR><TD>R1</TD><TD>1</TD><TD>4</TD><TD>0</TD><TD>0</TD><TR><TR><TD>R2</TD><TD>2</TD><TD>0</TD><TD>5</TD><TD>0</TD><TR><TR><TD>R3</TD><TD>3</TD><TD>0</TD><TD>0</TD><TD>0</TD><TR><TR><TD>R4</TD><TD>0</TD><TD>0</TD><TD>0</TD><TD>6</TD><TR></TBODY><TABLE>Thanks