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The distributed and heterogeneous nature of the Semantic Web makes it very difficult for
users to find ontologies. The Unified Ontology View (UOV) was proposed in (Harrison et
al., 2005), and UOV provides a layer that hides the heterogeneous and distributed nature of
the ontology network. The user is able to access the ontology network from anywhere and
obtain a unified view of the ontologies in the network. Figure 9 gives an overview of the
network environment which includes the servers, the ontology projects, and the client
application. In this network, whether the Client is connected to server A, B, or C is
irrelevant; the Client will be presented with the same view of the ontology projects in the
ontology network.
Fig. 6. Server view of ontology projects
Figure 7 shows the ontology projects from the perspective of the Client. When the Client
connects to the ontology network, it only sees the ontology projects. It is possible that the
ontology projects are distributed among many different types of systems, however, the
Client does not need to be aware of this fact.
The ontology management system implemented the idea of a UOV by using a peer-to-peer
(P2P) architecture, as shown in Figure 8. Knowledge projects created with the Ontology
Editor are stored in a database or knowledge repository, which is connected to a Feeder
node. The Feeder node that the Ontology Editor connects to may be local or remote. Feeder
nodes can share knowledge projects with each other. The Feeder nodes discover other
feeder nodes by contacting a central Hub node. Ontology projects are automatically added
to the network when they are created with the Project Wizard. Once a project is added to a
node on the network, it can be accessed from any node in the network.
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