Shredding XML with Document... to XMLTable

Question

Hi,
I'm relatively new to XML, so apologies in advanace for any solecisms!
I am trying to shred an XML document to a relational table (11g v2). A simplified procedure demonstrating what I am trying to do is below.
DECLARE
v_xml CLOB :=
'<?xml version="1.0" encoding="UTF-8" ?>
<Document xmlns="urn:xxxxxx." xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:yyyyyy zzzz.xsd">
     <TrfInfo>
          <GrpHdr>
               <MsgId>1001</MsgId>
               <CreDt>2011-05-27</CreDt>
               <NoTxs>10</NoTxs>
          </GrpHdr>
     </TrfInfo>
</Document>';
v_msgid VARCHAR2(255);
v_credt VARCHAR2(255);
v_notxs VARCHAR2(255);
BEGIN
SELECT *
INTO v_msgid, v_credt, v_notxs
FROM XMLTABLE('$aaa/Document/TrfInfo/GrpHdr' PASSING XMLTYPE(v_xml) AS "aaa"
COLUMNS message_identifier VARCHAR2(255) PATH 'MsgId'
,created_date_time VARCHAR2(255) PATH 'CreDt'
,number_of_transactions VARCHAR2(255) PATH 'NoTxs'
dbms_output.put_line('MsgId ' || v_msgid || ' CreDt ' || v_credt || ' NoTxs ' || v_notxs);
END;
If I do this then I get:
ERROR at line 1:
ORA-01403: no data found
ORA-06512: at line 20
But if I miss out the /Document line, it works:
DECLARE
v_xml CLOB :=
'<?xml version="1.0" encoding="UTF-8" ?>
     <TrfInfo>
          <GrpHdr>
               <MsgId>1001</MsgId>
               <CreDt>2011-05-27</CreDt>
               <NoTxs>10</NoTxs>
          </GrpHdr>
     </TrfInfo>';
v_msgid VARCHAR2(255);
v_credt VARCHAR2(255);
v_notxs VARCHAR2(255);
BEGIN
SELECT *
INTO v_msgid, v_credt, v_notxs
FROM XMLTABLE('$aaa/TrfInfo/GrpHdr' PASSING XMLTYPE(v_xml) AS "aaa"
COLUMNS message_identifier VARCHAR2(255) PATH 'MsgId'
,created_date_time VARCHAR2(255) PATH 'CreDt'
,number_of_transactions VARCHAR2(255) PATH 'NoTxs'
dbms_output.put_line('MsgId ' || v_msgid || ' CreDt ' || v_credt || ' NoTxs ' || v_notxs);
END;
I then get:
MsgId 1001 CreDt 2011-05-27 NoTxs 10
PL/SQL procedure successfully completed.
I did try putting the full <Document......> tag in the XMLTABLE statement, but then I got:
ERROR at line 1:
ORA-19114: XPST0003 - error during parsing the XQuery expression:
LPX-00801: XQuery syntax error at 'xmlns'
1 $aaa/Document xmlns="urn:xxxxxx." xmlns:xsi="http://www.w3.org/2001/XMLSche
- ^
ORA-06512: at line 20
Could someone please tell me how I should handle this? Is there a facility on XMLTABLE to allow me to ignore the <Document...> line?
Is there a better way of doing this?
All responses gratefully received!
Graham

Answer 1

Hi,
The document has a default namespace, so you have to declare it in XMLTable :
SQL> DECLARE
  2     v_xml CLOB :=
  3  '<?xml version="1.0" encoding="UTF-8" ?>
  4  <Document xmlns="urn:xxxxxx." xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:yyyyyy zzzz.xsd">
  5       <TrfInfo>
  6            <GrpHdr>
  7                 <MsgId>1001</MsgId>
  8                 <CreDt>2011-05-27</CreDt>
  9                 <NoTxs>10</NoTxs>
10            </GrpHdr>
11       </TrfInfo>
12  </Document>';
13 
14  v_msgid VARCHAR2(255);
15  v_credt VARCHAR2(255);
16  v_notxs VARCHAR2(255);
17 
18  BEGIN
19 
20        SELECT  *
21          INTO v_msgid, v_credt, v_notxs
22          FROM XMLTABLE(
23                  XMLNamespaces(default 'urn:xxxxxx.'),
24                  '$aaa/Document/TrfInfo/GrpHdr' PASSING XMLTYPE(v_xml) AS "aaa"
25                    COLUMNS  message_identifier      VARCHAR2(255)   PATH 'MsgId'
26                            ,created_date_time       VARCHAR2(255)   PATH 'CreDt'
27                            ,number_of_transactions  VARCHAR2(255)   PATH 'NoTxs'
28                            );
29 
30     dbms_output.put_line('MsgId ' || v_msgid || ' CreDt ' || v_credt || ' NoTxs ' || v_notxs);
31 
32  END;
33  /
MsgId 1001 CreDt 2011-05-27 NoTxs 10
PL/SQL procedure successfully completed
http://download.oracle.com/docs/cd/E11882_01/appdev.112/e16659/xdb_xquery.htm#CBABFGAJ