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6. CONCLUSION 
In this paper, we introduced the concept of an Ontology-based Object 
Catalog (OGOC) as the pivot of a federation of independent geo-object 
sources. The paper presented a generic architecture and a framework that 
facilitates generating customized catalogs for a specific application domain.
An OGOC stores a reference ontology and ontologies representing the 
conceptual schemas of the sources. The reference ontology may include a set 
of reference instances, which are sometimes essential to guarantee 
interoperability. In this context, the proposed concept of catalog is similar to 
a gazetteer, as in geographic applications.
We are currently specifying the framework. We intend to test the 
framework architecture by instantiating the hot-spots as follows:
• Reference ontology application domain: geographic application domain;
• Catalog access interface: Web services; 
• Ontology repository: implemented using API Jena
5
;
• Query language: RDQL; 
ACKNOWLEDGMENTS 
We gratefully acknowledge the helpful suggestions received from 
Nicolau Meisel. This work is partially supported by CAPES/Brazil and 
CNPq/Brazil grant 552068/2002-0 and 552040/2002-9. 
REFERENCES 
Atkinson, R., and Fitzke, J., 2002, Gazetteer Service Profile of the Web Feature Service 
Implementation Specification, Version 0.9, OGC 02-076r3, OpenGIS© Discussion Paper, 
OpenGIS Consortium; 
http://www.opengis.org/docs/02-076r3.pdf
5
Jena API Framework: 
http://jena.sourceforge.net/

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