Extract on xmltype with multiple namespaces

Question

Given the following xml instance document can you share an example to retrieve the data of the <TransactionNumber> and <IdValue> elements using the XMLType data type. This document is generated by XBD and has 3 different namespaces.
declare
lv_xml xmltype := xmltype(
'<ConfirmAddStudentDeposit xmlns="urn:sungardsct:udc:ws:messages:1.0">
     <StudentDepositIdentifier>
          <AccountIdentifier xmlns="urn:sungardsct:udc:domain:ar:1.0">
               <IdValue xmlns="urn:sungardsct:udc:resources:common:1.0" name="BannerUID">210009102</IdValue>
          </AccountIdentifier>
          <TransactionNumber xmlns="urn:sungardsct:udc:domain:ar:1.0">8</TransactionNumber>
          <ReceiptNumber xmlns="urn:sungardsct:udc:domain:ar:1.0">1606</ReceiptNumber>
     </StudentDepositIdentifier>
</ConfirmAddStudentDeposit>');
lv_frag xmltype;
begin
lv_frag := lv_xml.extract('/ConfirmAddStudentDeposit/StudentDepositIdentifier/TransactionNumber', 'xmlns="urn:sungardsct:udc:ws:messages:1.0" xmlns="urn:sungardsct:udc:domain:ar:1.0"');
if lv_frag is null then
dbms_output.put_line('NO good');
else
dbms_output.put_line('maybe working');
end if;
end;

Answer 1

You'll need to use prefixs or namespaces
declare
lv_xml xmltype := xmltype(
'<ConfirmAddStudentDeposit xmlns="urn:sungardsct:udc:ws:messages:1.0">
<StudentDepositIdentifier>
<AccountIdentifier xmlns="urn:sungardsct:udc:domain:ar:1.0">
<IdValue xmlns="urn:sungardsct:udc:resources:common:1.0" name="BannerUID">210009102</IdValue>
</AccountIdentifier>
<TransactionNumber xmlns="urn:sungardsct:udc:domain:ar:1.0">8</TransactionNumber>
<ReceiptNumber xmlns="urn:sungardsct:udc:domain:ar:1.0">1606</ReceiptNumber>
</StudentDepositIdentifier>
</ConfirmAddStudentDeposit>');
lv_frag xmltype;
begin
lv_frag := lv_xml.extract('/a:ConfirmAddStudentDeposit/a:StudentDepositIdentifier/c:TransactionNumber', 'xmlns:a="urn:sungardsct:udc:ws:messages:1.0" xmlns:c="urn:sungardsct:udc:domain:ar:1.0"');
if lv_frag is null then
dbms_output.put_line('NO good');
else
dbms_output.put_line('maybe working');
end if;
end;