associators in sfcb

Hi All,
I am writing a provider in Vmware ESX 3.0 sfcb.I am facing following
problem
 
I have 2 derived classes of
CIM_SystemDevice.XYZ_SystemDevice1,XYZ_SystemDevice2.
if a client makes following call 
cimcli -n myNameSpace a CIM_ComputerSystem -ac CIM_SystemDevice -niq -i
 
In case of pegasus,CIMOM itself will spawn as many threads as number of
derived class and will make call to provider.So provider will get two
calls with associationClass as XYZ_SystemDevice1 and XYZ_SystemDevice2.
 
But in sfcb provider gets only one call with associationClass as
CIM_SystemDevice.Is there any CMPI API to get all derived classes of a
particular class or association?
Any other way to access repository from provider?
 
Thanks in advance,
Sijo Kappen

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