XSU: Nested Collections?

Question

Does anyone know of a way to get around Oracle's limitation on nested collections?
I have been using XSU to present XML to our Java application layer using objects and object views. Casting multisets works fine for repeating elements as long as the elements themselves don't contain repeating elements. I have been able to get around this with nested cursors, but I am not sure that XSU was designed to work this way. I get a nasty error if any of the cursors return an empty set.
Example:
SELECT
company_name,
CURSOR(SELECT
dept_name,
CURSOR(SELECT
group_name
FROM group_table g
WHERE g.dept_id = d.dept_id) AS "GROUPS"
FROM
dept_table d
WHERE
d.company_id = c.company_id) AS "DEPARTMENTS"
FROM company_table c
If any of the above cursors returns an empty set then I get the following error:
oracle.xml.sql.OracleXMLSQLException: Closed Statement: oracle.jdbc.oci8.OCIDBStatement@18f375
Anyone gotten around this another way?

Answer 1

Hi Christopher,
I posted a similar question before. I even don't know how to create such a table to store XML data.
Like your example
<company>
<dept>
<group>
<emp>
</emp>
</group>
<group>
</group>
</dept>
<dept>
</dept>
</company>
Do you know how to create a table to store this kind of xml data with several hierarchical levels?
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