Core data warehouse-component in SAP BW

Hi experts,
a typical data warehouse reference architecture (as described in many books) basically consists of a core data warehouse, an ods and data marts.
As far as I understood in SAP BW an ODS object acts as a storage location for consolidated and cleaned-up transaction data (transaction data or master data, for example) on the document (atomic) level. This data is not stored permanently but overritten as soon as changes are applied to data in the operational systems.
But where in SAP BW is a component like a core data warehouse that stores consolidated and cleaned-up transaction data on atomic level permanently without overwriting it????
Thanx
Axel

hi Dinesh
thanx for the PDF! Does it refer to SAP BW 3.5 or NW2004?
Do I get it right that in SAP BW version 3.5 there is no "core data warehouse" that provides persistent historic data on a granular level but only ODS-Objects that can only provide the latest integrated but NOT HISTORIC data on a granular level?
And do they actually introduce a new component in NW2004 (referring to page 20 in PDF) or only suggest a differnt way of modelling a set of ODS-Objects and InfoCubes (that have already existed in version 3.5) with granular data to a "Data Warehouse Layer"?
Thanx
Axel
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