Fetching embedded collection attributes

Hi guys,
I want to retreive a collection attribute of an object in Oci. Say, i have following types:
CREATE TYPE a AS VARRAY(10) OF NUMBER
CREATE TYPE b AS OBJECT( aa NUMBER, ab a)
CREATE TABLE c ( aaa b )
Now i have following query in my OCI-Application: SELECT aaa FROM c;
Since I don't know the types of the objects at compile time, I'm doing some stuff with OCIDescribeAny & friends to get the datatypes of the different objects. Everything went's fine until I want to access the attribute ab of type b. After succesfully getting the value of the attribute with OCIObjectGetAttr I cast the dvoid* I got from this function to OCIColl* and pass it to OCIIterCreate to create an iterator in order to access the collection elements. At this point however, OCI either delivers an invalid iterator, or even worse, crashes.
Everything wents fine if I have a embedded object attribute which is not an collection.
So, what am I'm doing wrong? Any suggestions?
Thanks a lot in advance!

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제품 : SQL*PLUS
작성날짜 : 1999-05-12
COLLECTION TYPE 변경 방법
=========================
collection type은 attribute나 column의 데이타 타입으로
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