How can i count the times one TAG occurred in a XMLTYPE?

hi all
is there method i can use to count the times one specified TAG occurred in a XMLTYPE?
i just konw the method getClobVal,existNode,extract,...
but none seems can help this
anyone can help me?

i see
i think i know how to use Xpath func
but when i try the following statement on sqlplus( Release 9.2.0.4.0),it says :"the XPATH is not supportted"
declare
l_xml xmltype;
num number;
begin
select XML_BODY into l_xml from KD_SHIMEN_SEISEI w where FILE='SMNDATA';
--get value OK!
num := xmltype.extract(l_xml,'/Tag1[1]/Tag2/text()').getNumberVal();
--sum or count ,failed,Xpath not support?
num := xmltype.extract(l_xml,'sum(/Tag1/Tag2/text())').getNumberVal();
DBMS_OUTPUT.PUT_LINE(num);
end;
can u explain this?

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How can i count the times one TAG occurred in a XMLTYPE?

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