Trouble including registered XML Schema in generated XML

Question

Hello,
I'm new to XMLDB, and find myself wanting to build an XML document that conforms
to a paricular XML schema. I'm looking for help in "passing" the shema into the
xml query, and for advice (i may not be going about things in the best way possible).
my data comes from three different sources: deliveries, origin of deliveries (warehouse),
and a user-defined parameter (number of vehicles). I am putting the xml data together via union statements.
this is slightly undesireable due to the limitations on union (no xmltypes, no clobs)
and the size limitation of the varchar datatype. If there is a better way of structuring
the end XML document (all three sources, one output record) then please advise me.
I am having issues "passing" the registered XML schema to the SYS_XMLGEN function,
so if you see where I've made a mistake, please point it out.
Last thing, Oracle version: 9.2.0.4.0 (aka 9iR2)
--Register a new XML schema
--Since this is a GLOBAL schema, register it as privileged user (SYS).
DECLARE
       vrp varchar2(10000) :=
'<xs:schema targetNamespace="http://example.com/vrp.xsd"
    xmlns:vrp="http://example.com/vrp.xsd"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    elementFormDefault="qualified">
    <xs:complexType name="VehicleRoute">
        <xs:sequence>
            <xs:element name="Stops" type="vrp:Stops" minOccurs="1" maxOccurs="1" />
            <xs:element name="Vehicles" type="xs:string" minOccurs="1" maxOccurs="1" />
            <xs:element name="Warehouse" type="vrp:Warehouse" minOccurs="1" maxOccurs="1" />
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name="Stops">
        <xs:sequence>
            <xs:element name="Stop" type="vrp:Stop" minOccurs="1" maxOccurs="unbounded" />
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name="Stop">
        <xs:sequence>
            <xs:element name="Documents" type="vrp:Documents" minOccurs="1" maxOccurs="1" />
            <xs:element name="Stop_Address" type="xs:string" minOccurs="1" maxOccurs="1" />
            <xs:element name="Stop_Minutes" type="xs:double" minOccurs="1" maxOccurs="1" />
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name="Documents">
        <xs:sequence>
            <xs:element name="Document" type="xs:string" minOccurs="1" maxOccurs="unbounded" />
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name="Warehouse">
        <xs:sequence>
            <xs:element name="Warehouse_Address" type="xs:string" minOccurs="1" maxOccurs="1" />
        </xs:sequence>
    </xs:complexType>
    <xs:element name="Vehicle_Route" type="vrp:VehicleRoute" />
</xs:schema>';  
begin
  --"CUSTOM" is the name of my database user - the SCHEMA in which this development should occur.
     dbms_xmlschema.registerschema('http://example.com/vrp.xsd', vrp, false, false, false, false, false, 'CUSTOM');
END;Here is the XML schema (as viewed by the 'CUSTOM' user):
<xs:schema targetNamespace="http://example.com/vrp.xsd" xmlns:vrp="http://example.com/vrp.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" xmlns:oraxdb="http://xmlns.oracle.com/xdb" oraxdb:flags="17" oraxdb:schemaURL="http://example.com/vrp.xsd" oraxdb:schemaOwner="CUSTOM" oraxdb:numProps="10">
  <xs:complexType name="VehicleRoute" oraxdb:SQLType="CLOB">
    <xs:sequence>
      <xs:element name="Stops" type="vrp:Stops" minOccurs="1" maxOccurs="1" oraxdb:propNumber="2225" oraxdb:global="false" oraxdb:memType="258" oraxdb:SQLInline="true" oraxdb:MemInline="false" oraxdb:JavaInline="false"/>
      <xs:element name="Vehicles" type="xs:string" minOccurs="1" maxOccurs="1" oraxdb:propNumber="2226" oraxdb:global="false" oraxdb:memType="1" oraxdb:SQLInline="true" oraxdb:MemInline="true" oraxdb:JavaInline="true"/>
      <xs:element name="Warehouse" type="vrp:Warehouse" minOccurs="1" maxOccurs="1" oraxdb:propNumber="2227" oraxdb:global="false" oraxdb:memType="258" oraxdb:SQLInline="true" oraxdb:MemInline="false" oraxdb:JavaInline="false"/>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name="Stops" oraxdb:SQLType="CLOB">
    <xs:sequence>
      <xs:element name="Stop" type="vrp:Stop" minOccurs="1" maxOccurs="unbounded" oraxdb:propNumber="2228" oraxdb:global="false" oraxdb:memType="258" oraxdb:SQLInline="true" oraxdb:MemInline="false" oraxdb:JavaInline="false"/>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name="Stop" oraxdb:SQLType="CLOB">
    <xs:sequence>
      <xs:element name="Documents" type="vrp:Documents" minOccurs="1" maxOccurs="1" oraxdb:propNumber="2229" oraxdb:global="false" oraxdb:memType="258" oraxdb:SQLInline="true" oraxdb:MemInline="false" oraxdb:JavaInline="false"/>
      <xs:element name="Stop_Address" type="xs:string" minOccurs="1" maxOccurs="1" oraxdb:propNumber="2230" oraxdb:global="false" oraxdb:memType="1" oraxdb:SQLInline="true" oraxdb:MemInline="true" oraxdb:JavaInline="true"/>
      <xs:element name="Stop_Minutes" type="xs:double" minOccurs="1" maxOccurs="1" oraxdb:propNumber="2231" oraxdb:global="false" oraxdb:memType="2" oraxdb:SQLInline="true" oraxdb:MemInline="true" oraxdb:JavaInline="true"/>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name="Documents" oraxdb:SQLType="CLOB">
    <xs:sequence>
      <xs:element name="Document" type="xs:string" minOccurs="1" maxOccurs="unbounded" oraxdb:propNumber="2232" oraxdb:global="false" oraxdb:memType="1" oraxdb:SQLInline="true" oraxdb:MemInline="true" oraxdb:JavaInline="true"/>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name="Warehouse" oraxdb:SQLType="CLOB">
    <xs:sequence>
      <xs:element name="Warehouse_Address" type="xs:string" minOccurs="1" maxOccurs="1" oraxdb:propNumber="2233" oraxdb:global="false" oraxdb:memType="1" oraxdb:SQLInline="true" oraxdb:MemInline="true" oraxdb:JavaInline="true"/>
    </xs:sequence>
  </xs:complexType>
  <xs:element name="Vehicle_Route" type="vrp:VehicleRoute" oraxdb:propNumber="2224" oraxdb:global="true" oraxdb:SQLType="CLOB" oraxdb:SQLName="Vehicle_Route" oraxdb:memType="258"/>
</xs:schema>Here is sample data for reproducing what I'm seeing:
--Create the "document" table
create table vrp_document
(document_num varchar2(10),
document_minutes number(10),
document_address varchar2(30));
--Sample "document" data
insert into vrp_document (document_num, document_minutes, document_address)
values ('TEST1', 30, '1234 ELM ST');
insert into vrp_document (document_num, document_minutes, document_address)
values ('TEST2', 20, '1234 ELM ST');
insert into vrp_document (document_num, document_minutes, document_address)
values ('TEST3', 40, '1234 MAPLE ST');
insert into vrp_document (document_num, document_minutes, document_address)
values ('TEST3', 15, '1234 YEW ST');
--Create the "warehouse" table
create table vrp_warehouse
(warehouse_id varchar2(3),
warehouse_address varchar2(30));
--Sample "warehouse" data
insert into vrp_warehouse (warehouse_id, warehouse_address)
values ('100', '900 MY OWN WAY');Query to produce XML
Please note, I realize that for the data provided, the aggregations (and sub queries)
are a little over the top. They are however necessary for my actual data set.
SELECT SYS_XMLGEN(xmlagg(XMLTYPE(xmlroute)),  xmlformat.createFormat('Vehicle_Route')).getStringVal() Delivery_XML_Data
FROM (SELECT XMLELEMENT("Stops",
          XMLAGG(XMLELEMENT("Stop",    
          XMLCONCAT(
            XMLELEMENT("Documents",
                xmlagg(xmlelement("Document", t.document))),
              xmlforest(t.document_address "Stop_Address",  
             SUM(t.document_minutes) "Stop_Minutes"))))).getStringVal() AS xmlroute
from     (select   s.document_num document, 
                   s.document_address,
                   sum(s.document_minutes) document_minutes
          from     vrp_document s       
          group by s.document_num, s.document_address) t
GROUP BY t.document_address
UNION
SELECT   XMLELEMENT("Warehouse",
         xmlforest(
          w.warehouse_address "Warehouse_Address")).getstringval()
from     vrp_warehouse w
WHERE    w.warehouse_id = '100'
union
select   xmlelement("Vehicles", '&Number_Of_Vehicles').getstringval()
FROM     dual) g;This query produces the following (Note. Answer "1" or any other integer for &Number_Of_Vehicles):
The only other thing I want is to mention the above schema (that is, xmlns:http://example.com/vrp) or however that goes.
I realize I can "fudge" this by assigning the attribute for various elements, but I think the "right" way would be to modify that call to createFormat().
<?xml version="1.0"?>
<Vehicle_Route>
<Stops>
  <Stop>
    <Documents>
      <Document>TEST1</Document>
      <Document>TEST2</Document>
    </Documents>
    <Stop_Address>1234 ELM ST</Stop_Address>
    <Stop_Minutes>50</Stop_Minutes>
  </Stop>
  <Stop>
    <Documents>
      <Document>TEST3</Document>
    </Documents>
    <Stop_Address>1234 MAPLE ST</Stop_Address>
    <Stop_Minutes>40</Stop_Minutes>
  </Stop>
  <Stop>
    <Documents>
      <Document>TEST3</Document>
    </Documents>
    <Stop_Address>1234 YEW ST</Stop_Address>
    <Stop_Minutes>15</Stop_Minutes>
  </Stop>
</Stops>
<Vehicles>1</Vehicles>
<Warehouse>
  <Warehouse_Address>900 MY OWN WAY</Warehouse_Address>
</Warehouse>
</Vehicle_Route>I have tried various permutation of the following with no success:
Currently, the error is something serious:
ORA-00600: internal error code, arguments: [kkdotat1], [], [], [], [], [], [], []
00600. 00000 - "internal error code, arguments: [%s], [%s], [%s], [%s], [%s], [%s], [%s], [%s]"
*Cause:    This is the generic internal error number for Oracle program
exceptions.     This indicates that a process has encountered an
exceptional condition.
*Action:   Report as a bug - the first argument is the internal error number
SELECT SYS_XMLGEN(xmlagg(XMLTYPE(xmlroute)),  xmlformat.createFormat('Vehicle_Route', 'USE_GIVEN_SCHEMA', 'http://example.com/vrp.xsd', 'http://example.com/vrp.xsd')).getStringVal() Delivery_XML_Data
. . .Edited by: user2316919 on Jan 21, 2010 3:46 PM

Answer 1

Cannot find a cleanest solution:
SQL>  select xmltype('<?xml version="1.0"?>'||
  2                  xmlelement("Vehicle_Route",
  3                     xmlattributes('http://www.w3.org/2001/XMLSchema-instance' AS "xmlns:xsi",
  4                                   'http://example.com/vrp.xsd' AS "xsi:schemaLocation"
  5                                   ),
  6                     xmlagg(xmltype(xmlroute))
  7                     ).extract('/*')
  8                  ) Delivery_XML_Data
  9   FROM (SELECT XMLELEMENT("Stops",
10             XMLAGG(XMLELEMENT("Stop",    
11             XMLCONCAT(
12               XMLELEMENT("Documents",
13                   xmlagg(xmlelement("Document", t.document))),
14             xmlforest(t.document_address "Stop_Address",  
15                SUM(t.document_minutes) "Stop_Minutes"))))).getStringVal() AS xmlroute
16   from     (select   s.document_num document, 
17                      s.document_address,
18                      sum(s.document_minutes) document_minutes
19             from     vrp_document s       
20             group by s.document_num, s.document_address) t
21   GROUP BY t.document_address
22   UNION
23   SELECT   XMLELEMENT("Warehouse",
24             xmlforest(
25              w.warehouse_address "Warehouse_Address")).getstringval()
26    from     vrp_warehouse w
27    WHERE    w.warehouse_id = '100'
28    union
29    select   xmlelement("Vehicles", '&Number_Of_Vehicles').getstringval()
30    FROM     dual) g;
Immettere un valore per number_of_vehicles: 1
vecchio  29:   select   xmlelement("Vehicles", '&Number_Of_Vehicles').getstringval()
nuovo  29:   select   xmlelement("Vehicles", '1').getstringval()
DELIVERY_XML_DATA
<?xml version="1.0"?><Vehicle_Route xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schema
http://example.com/vrp.xsd">
  <Stops>
    <Stop>
      <Documents>
        <Document>TEST1</Document>
        <Document>TEST2</Document>
      </Documents>
      <Stop_Address>1234 ELM ST</Stop_Address>
      <Stop_Minutes>50</Stop_Minutes>
    </Stop>
    <Stop>
      <Documents>
        <Document>TEST3</Document>
      </Documents>
      <Stop_Address>1234 MAPLE ST</Stop_Address>
      <Stop_Minutes>40</Stop_Minutes>
    </Stop>
    <Stop>
      <Documents>
        <Document>TEST3</Document>
      </Documents>
      <Stop_Address>1234 YEW ST</Stop_Address>
      <Stop_Minutes>15</Stop_Minutes>
    </Stop>
  </Stops>
  <Vehicles>1</Vehicles>
  <Warehouse>
    <Warehouse_Address>900 MY OWN WAY</Warehouse_Address>
  </Warehouse>
</Vehicle_Route>
{code}
Max
[My Italian Oracle blog|http://oracleitalia.wordpress.com/2010/01/17/supporto-di-xml-schema-in-oracle-xmldb/]