2.2. The Conceptual Level
At the conceptual level, all communication between people and the information system is handled by the conceptual information processor. This communication may be divided into three main stages:
The modeler enters the conceptual schema for the UoD into the system. The CIP accepts the schema if and only if it is consistent with the metaconceptual schema.
The user updates the database by adding or deleting specific facts. The CIP accepts an update if and only if it is consistent with the conceptual schema.
The user queries the system about the UoD and is answered by the CIP. The CIP can supply information about the conceptual schema or the database, provided it has stored the information or can derive it.
In these three ...
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