How to read a XML file from BLOB column and insert in a table - PL/SQL Only

Hi,
To make data load more simple to end user instead placing file on the server and use SQL-LOADER, I came up with new idea that using oracle ebusiness suite attachment functionality. that loads a XML file from local PC to a database column(table is fnd_attachments, default data type is BLOB over here).
I tried with DBMS_LOB and didnt get around.
Please can anyone tell me how to read the BLOB column using PL/SQL and store the data in a oracle table. Here's the sample XML file and table structure FYI.
<?xml version="1.0" encoding="UTF-8"?>
<dataroot xmlns:od="urn:schemas-microsoft-com:officedata" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="Corporate_alloc.xsd" generated="2009-07-07T14:17:49">
<Corporate_alloc>
<PKG_CODE>BKCORP</PKG_CODE>
<PKG_NAME>Corporate Edition - Books</PKG_NAME>
<DET_CODE>B9780080543758</DET_CODE>
<DET_NAME>Waves, Tides and Shallow-Water Processes</DET_NAME>
<ALLOCATION_RATIO>0.000041</ALLOCATION_RATIO>
</Corporate_alloc>
<Corporate_alloc>
<PKG_CODE>BKCORP</PKG_CODE>
<PKG_NAME>Corporate Edition - Books</PKG_NAME>
<DET_CODE>B9780080534343</DET_CODE>
<DET_NAME>Hydrostatically Loaded Structures</DET_NAME>
<ALLOCATION_RATIO>0.000127</ALLOCATION_RATIO>
</Corporate_alloc>
</dataroot>
CREATE TABLE TEST_XML
( PKG_CODE VARCHAR2(50),
PKG_NAME VARCHAR2(100),
DET_CODE VARCHAR2(20),
DET_NAME VARCHAR2(500),
ALLOCATION_RATIO NUMBER )
Thanks
EBV

In regards to #3, use the COLUMNS functionality of XMLTable instead of using Extract. Two simple examples are
Re: XML Data - Caliculate fields
Re: Extractvalue function not recognised

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