ORA-19279 Error on XQuery

Question

I'm having trouble getting subordinate tag data out of this structure:
<CASE_BATCH>
<CASEDETAIL>
<HEADER>
<PERSON_ID>214339</PERSON_ID>
</HEADER>
<ASSOC>
<AP_ID>166646</AP_ID>
<AP_NAME>
<LASTNAME>TEST</LASTNAME>
<FIRSTNAME>TEST</FIRSTNAME>
</AP_NAME>
</ASSOC>
<ASSOC>
<AP_ID>166647</AP_ID>
<AP_NAME>
<LASTNAME>TEST2</LASTNAME>
<FIRSTNAME>TEST2</FIRSTNAME>
</AP_NAME>
</ASSOC>
</CASEDETAIL>
</CASEBATCH>
One of the many XQueries I've tried is:
select b.*
from eachFile,
xmltable('/CASE_BATCH/CASEDETAIL'
passing eachfile.mytype
columns
extnum number PATH '/CASEDETAIL/HEADER/PERSON_ID') A,
xmltable('CASE_BATCH/CASEDETAIL'
passing eachfile.mytype
columns
extnum number PATH '/CASEDETAIL/HEADER/PERSON_ID',
id Number Path '/CASEDETAIL/ASSOC/AP_ID',
lastname varchar2(50) '/CASEDETAIL/ASSOC/AP_NAME/LASTNAME',
firstname varchar2(50) '/CASEDETAIL/ASSOC/AP_NAME/FIRSTNAME') b
where a.extnum = 214339 and
a.extnum = b.extnum
If I leave the b.extnum out of it the column and where clause, and set the xmlTable path down to 'CASE_BATCH/CASEDETAIL/ASSOC' and the b columns path as
'/ASSOC/PERSON_ID' then I return all data, regardless of where in the file it's located. That makes sense because I don't have the extnum in the where clause to filter out unrelated tags.
How can I make this work?

Answer 1

Here is an example of using the XMLTable() function to create a master-detail view over multiple levels of your XML data. This PURCHASEORDER table can be found in the OE (order entry) sample schema when you create a new database instance with DBCA. Notice the passing clause (i.e., passing m.items ) in the second XMLTable() function.
Send me email (geoff dot lee at oracle dot com) directly if you still have problems.
Regards,
Geoff
SQL> create or replace view PO_MASTER_DETAIL_VIEW
  2  as
  3  select m.REFERENCE,m.REQUESTOR,m.USERID,m.COSTCENTER,item.*
  4    from PO_SL_BIX_TABLE,
  5         xmltable
  6         ('/PurchaseOrder' passing object_value
  7           COLUMNS
  8             REFERENCE       varchar2(30)   path 'Reference',
  9             REQUESTOR       varchar2(128)  path 'Requestor',
10             USERID          varchar(10)    path 'User',
11             COSTCENTER      varchar2(4)    path 'CostCenter',
12             ITEMS                   xmltype              path 'LineItems'
13         ) m,
14         xmltable
15         ('/LineItems/LineItem' passing m.items
16          COLUMNS
17             ITEMNO            number(38)     path '@ItemNumber',
18             DESCRIPTION       varchar2(1024) path 'Description',
19             PARTNO            varchar2(56)   path 'Part/@Id',
20             QUANTITY          number(38)     path 'Part/@Quantity',
21             UNITPRICE         number(12,2)   path 'Part/@UnitPrice'
22         ) item
23  /
View created.
SQL>
SQL> describe PO_MASTER_DETAIL_VIEW
Name                                      Null?    Type
REFERENCE                                          VARCHAR2(30)
REQUESTOR                                          VARCHAR2(128)
USERID                                             VARCHAR2(10)
COSTCENTER                                         VARCHAR2(4)
ITEMNO                                             NUMBER(38)
DESCRIPTION                                        VARCHAR2(1024)
PARTNO                                             VARCHAR2(56)
QUANTITY                                           NUMBER(38)
UNITPRICE                                          NUMBER(12,2)
SQL> select REFERENCE, ITEMNO, PARTNO
  2  from PO_MASTER_DETAIL_VIEW
  3  where USERID = 'SBELL'
  4  and PARTNO  in ( '37429121726', '37429122129', '715515009058' )
  5  /
REFERENCE                          ITEMNO PARTNO
SBELL-20021009123335280PDT              7 715515009058
SBELL-20021009123335280PDT             11 37429121726
SBELL-20021009123338304PDT              9 37429122129
SBELL-20021009123336331PDT              2 715515009058
SBELL-2002100912333763PDT              19 37429122129
SBELL-2002100912333601PDT               1 715515009058
SBELL-20021009123336532PDT              2 37429121726
SBELL-20021009123338204PDT             12 715515009058
8 rows selected.