Federated database systems for managing distributed, heterogeneous, and autonomous databases
ACM Computing Surveys (CSUR) - Special issue on heterogeneous databases
The Clio project: managing heterogeneity
ACM SIGMOD Record
Clio: a semi-automatic tool for schema mapping
SIGMOD '01 Proceedings of the 2001 ACM SIGMOD international conference on Management of data
Vocabulary development for markup languages: a case study with maritime information
Proceedings of the 11th international conference on World Wide Web
Interconnecting Heterogeneous Information Systems
Interconnecting Heterogeneous Information Systems
Handling semantic heterogeneities using declarative agreements
Proceedings of the 10th ACM international symposium on Advances in geographic information systems
A conceptual architecture for semantic web enabled web services
ACM SIGMOD Record
The Index-Based XXL Search Engine for Querying XML Data with Relevance Ranking
EDBT '02 Proceedings of the 8th International Conference on Extending Database Technology: Advances in Database Technology
Ontologies: A Silver Bullet for Knowledge Management and Electronic Commerce
Ontologies: A Silver Bullet for Knowledge Management and Electronic Commerce
Ontology alignment for real-world applications
dg.o '04 Proceedings of the 2004 annual national conference on Digital government research
Ontology-based geospatial XML query system
dg.o '04 Proceedings of the 2004 annual national conference on Digital government research
dg.o '04 Proceedings of the 2004 annual national conference on Digital government research
Ontology-based geospatial XML query system
dg.o '04 Proceedings of the 2004 annual national conference on Digital government research
Towards a semantics-based approach in the development of geographic portals
Computers & Geosciences
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This paper describes a Web-based query system for semantically heterogeneous government-produced data. Geospatial Web-based information systems and portals are currently being developed by various levels of government along with the GIS community. Typically, these sites provide data discovery and download capabilities but do not include the ability to pose DBMS type queries.One of the main problems in querying distributed government data sources is the difference in semantics used by various jurisdictions. We extend work in schema integration by focusing on resolving semantics at the value level in addition to the schema or attribute level. We illustrate our method using land use data, but the method works for any domain having a heterogeneous set of values. Our work starts from an XML Web-based DBMS and adds functionality to accommodate heterogeneous data between jurisdictions. Our ontology and query rewrite systems use mappings to enable querying across distributed heterogeneous data. This paper describes our current system.