Problem with XMLDOM package (Oracle 10.2.0.1.0)

Question

Hi,
I am using the dbms_xmldom package to generate xml files (specific structure).
Below is the code but It produces nothing (dbms_output does not return) :
DECLARE
doc xmldom.DOMDocument;
main_node xmldom.DOMNode;
root_node xmldom.DOMNode;
root_elmt xmldom.DOMElement;
transmissionHeaderNode xmldom.DOMNode;
transmissionHeaderElement xmldom.DOMElement;
item_node xmldom.DOMNode;
item_elmt xmldom.DOMElement;
item_text xmldom.DOMText;
buffer_problem CLOB;
BEGIN
doc := xmldom.newDOMDocument;
main_node := xmldom.makeNode(doc);
xmldom.setversion(doc,'1.0');
root_elmt := xmldom.createElement(doc, 'InvoiceTransmission');
root_node := xmldom.appendChild( main_node, xmldom.makeNode(root_elmt));
transmissionHeaderElement := xmldom.createElement(doc, 'TransmissionHeader');
transmissionHeaderNode := xmldom.appendChild(root_node, xmldom.makeNode(transmissionHeaderElement));
item_elmt := xmldom.createElement(doc, 'TransmissionDateTime');
item_node := xmldom.appendChild(transmissionHeaderNode, xmldom.makeNode(item_elmt));
item_text := xmldom.createTextNode(doc, TO_CHAR(SYSDATE,'DD-MM-YYYY'));
item_node := xmldom.appendChild(item_node, xmldom.makeNode(item_text));
item_elmt := xmldom.createElement(doc, 'IssuingOrganiszationID');
item_node := xmldom.appendChild(transmissionHeaderNode, xmldom.makeNode(item_elmt));
item_text := xmldom.createTextNode(doc,'0258');
item_node := xmldom.appendChild(item_node, xmldom.makeNode(item_text));
item_elmt := xmldom.createElement(doc, 'Version');
item_node := xmldom.appendChild(transmissionHeaderNode, xmldom.makeNode(item_elmt));
item_text := xmldom.createTextNode(doc, 'IATA:ISXMLInvoiceV3.0');
item_node := xmldom.appendChild(item_node, xmldom.makeNode(item_text));
xmldom.writetobuffer(doc, buffer_problem);
dbms_output.put_line(buffer_problem);
xmldom.freeDocument(doc);
END;
That's strange because when remove a code part like :
item_elmt := xmldom.createElement(doc, 'Version');
item_node := xmldom.appendChild(transmissionHeaderNode, xmldom.makeNode(item_elmt));
item_text := xmldom.createTextNode(doc, 'IATA:ISXMLInvoiceV3.0');
item_node := xmldom.appendChild(item_node, xmldom.makeNode(item_text));
I can get the ouput xml :
<?xml version="1.0"?>
<InvoiceTransmission>
<TransmissionHeader>
<TransmissionDateTime>26-10-2010</TransmissionDateTime>
<IssuingOrganiszationID>0258</IssuingOrganiszationID>
</TransmissionHeader>
</InvoiceTransmission>
I don't if it's a problem with xmldom or with dbms_output package...
Please someone can help me ?

Answer 1

Works fine for me
Connected to Oracle Database 10g Enterprise Edition Release 10.2.0.4.0
SQL> set serveroutput on;
SQL>
SQL> DECLARE
  2     doc xmldom.DOMDocument;
  3     main_node xmldom.DOMNode;
  4     root_node xmldom.DOMNode;
  5     root_elmt xmldom.DOMElement;
  6 
  7     transmissionHeaderNode xmldom.DOMNode;
  8     transmissionHeaderElement xmldom.DOMElement;
  9     item_node xmldom.DOMNode;
10     item_elmt xmldom.DOMElement;
11     item_text xmldom.DOMText;
12 
13     buffer_problem CLOB;
14 
15  BEGIN
16 
17     doc := xmldom.newDOMDocument;
18     main_node := xmldom.makeNode(doc);
19     xmldom.setversion(doc,'1.0');
20     root_elmt := xmldom.createElement(doc, 'InvoiceTransmission');
21     root_node := xmldom.appendChild( main_node, xmldom.makeNode(root_elmt));
22 
23     transmissionHeaderElement := xmldom.createElement(doc, 'TransmissionHeader');
24     transmissionHeaderNode := xmldom.appendChild(root_node, xmldom.makeNode(transmissionHeaderElement));
25 
26     item_elmt := xmldom.createElement(doc, 'TransmissionDateTime');
27     item_node := xmldom.appendChild(transmissionHeaderNode, xmldom.makeNode(item_elmt));
28     item_text := xmldom.createTextNode(doc, TO_CHAR(SYSDATE,'DD-MM-YYYY'));
29     item_node := xmldom.appendChild(item_node, xmldom.makeNode(item_text));
30 
31     item_elmt := xmldom.createElement(doc, 'IssuingOrganiszationID');
32     item_node := xmldom.appendChild(transmissionHeaderNode, xmldom.makeNode(item_elmt));
33     item_text := xmldom.createTextNode(doc,'0258');
34     item_node := xmldom.appendChild(item_node, xmldom.makeNode(item_text));
35 
36     item_elmt := xmldom.createElement(doc, 'Version');
37     item_node := xmldom.appendChild(transmissionHeaderNode, xmldom.makeNode(item_elmt));
38     item_text := xmldom.createTextNode(doc, 'IATA:ISXMLInvoiceV3.0');
39     item_node := xmldom.appendChild(item_node, xmldom.makeNode(item_text));
40 
41     --buffer_problem := 'a';  -- added to initialize clob
42     xmldom.writetobuffer(doc, buffer_problem);  -- change to writetoclob
43     dbms_output.put_line(buffer_problem);
44     xmldom.freeDocument(doc);
45 
46  END;
47  /
<?xml version="1.0"?>
<InvoiceTransmission>
  <TransmissionHeader>
    <TransmissionDateTime>26-10-2010</TransmissionDateTime>
    <IssuingOrganiszationID>0258</IssuingOrganiszationID>
    <Version>IATA:ISXMLInvoiceV3.0</Version>
  </TransmissionHeader>
</InvoiceTransmission>Suggestions:
- Use dbms_xmldom instead of just xmldom. Oracle changed the name in the 9i days and xmldom is a synonym to dbms_xmldom.
- Use .writeToClob intead of .writeToBuffer
- I would suggest trying to upgrade to .4 as you pick up a lot of improvements and bug fixes. Whether what you are encountering is a bug I cannot say but would seem so.
- See the FAQ under your sign-in name to learn how to use the tag to format the code like I did above.