PL/SQL procedure to process XML file

Question

I am just starting to work on xml, and we are using PL/SQL stored procedures to process xml file. I did find the sample code in the package (family.sql). This sample print out all element names and attributes. My questions are :
(1) I tried to modify the code to print out the element values (or Node values). Here is the code:
-- get all elements and values
nl := xmlparser.getElementsByTagName(doc, '*');
len := xmlparser.getLength(nl);
-- loop through elements
for i in 0..len-1 loop
n := xmlparser.item(nl, i);
dbms_output.put_line('NodeName: ' | | xmlparser.getNodeName(n) | | ' ');
dbms_output.put_line('NodeValue: ' | | xmlparser.getNodeValue(n) | | ' ');
end loop;
However, it did not print out the values, although it did print out the name. what's wrong with it? how can I get the value?
(2) I have the following xml file:
<?xml version="1.0"?>
<profile>
<id>1</id>
<name>Company</name>
<des>master profile</desc>
<subprofile>
<subid>1</subid>
<subname>group1</subname>
<subdesc>group profile</subdesc>
</subprofile>
</profile>
now, I'd like to print out all the children of the <subprofile> node, that is <subid>, <subname> and <subdesc>. Here is my code:
-- get subprofile nodelist
qnlist := xmlparser.getElementsByTagName(doc, 'subprofile');
-- get length of the nodelist
len := xmlparser.getLength(qnlist);
-- loop through elements
for i in 0..len-1 loop
qnode := xmlparser.item(qnlist, i);
qnnode := xmlparser.getFirstChild(qnode);
qnchild := xmlparser.getFirstChild(qnnode);
dbms_output.put_line(xmlparser.getNodeName(qnnode));
dbms_output.put_line(xmlparser.getNodeValue(qnchild));
LOOP
if (xmlparser.isNULL(xmlparser.getNextSibling(qnnode))) then exit;
END IF;
qnnode := xmlparser.getNextSibling(qnnode);
qnchild := xmlparser.getFirstChild(qnnode);
dbms_output.put_line(xmlparser.getNodeName(qnnode));
dbms_output.put_line(xmlparser.getNodeValue(qnchild));
END LOOP;
end loop;
when I execute the procedure, I get the following output:
#text
I am not sure what's wrong with it. Basically, I didn't know the procedure to traverse the tree since here it's a little different from OO programming. Could someone give a sample code which demonstrate the procedure which can get a specific element's name and values? (for my exapmle, the name and value of the <subname>, or <subid>, <subdesc>).
Also, is there a way to insert a part of xml file into a DB table? in my case, insert the subprofile into a table. I know the xmlgen package has a procedure to insert a xml file into a table, but not a part of xml. And can I insert a xml file into several tables instead of one table, using xmlgen package?
looking forward to hearing from you. any suggestion and sample code would be helpful. thank you very much.
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Answer 1

I sloved my first question: to get the Nodevalue, I need to use getFirstChild(n);
But, I still didn't figure out the second
problem. Actually, It works when I modified my xml file as following:
<?xml version="1.0"?>
<profile>
<id>1</id>
<name>Company</name>
<des>master profile</desc>
<subprofile><subid>1</subid><subname>group1</subname><subdesc>groupprofile</subdesc></subprofile>
</profile>
All the <subprofile>....</subprofile> must be in one line without any return. This is unbelievable! It suppose that xml does not matter new lines. I tested my code, it seems space is fine, but new line. Something must be wrong in my code.
please give any suggestion. Thanks,
Yudong
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