12.3. Overview
The OAI allows clients to access JEDMICS repository documents, document collections, and their associated metadata via its four external services. Clients connect through the Security Service, which authenticates and authorizes users and maintains the concept of a session between the client applications and the server tiers. Once connected, users can then obtain metadata through the Query Service that they can use to retrieve the physical data files corresponding to documents and images using the Image Query Service. Authorized clients may also print the files by using the Print Service.
Figure 12.1 illustrates the overall architecture of the OAI and the EJB components that it contains. The components are logically classified into ...
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