Yannis Tzitzikas, Nicolas Spyratos, and Panos Constantopoulos. "Mediators over Ontology-based Information Sources". In Second International Conference on Web Information Systems Engineering, WISE 2001. Home/Search Document Details and Download
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Scalability and Knowledge Reusability in Ontology Modeling - Jarrar, Meersman (2002) (Correct)
.... independently of language and across representational paradigm boundaries obviously is a hard problem of semantics. This issue has been extensively studied in various forms of schema and view integration, mostly in organization specific contexts, within the database field ( Sa98] AB01] [ZSC01] [PS98] 3. SCALABILITY Ontologies aim to be a shared and agreed semantic resource for a wide range of agents, thus, scalability is critical and a key success factor for ontology modeling approaches and ontology management systems; experience shows that unscalable solutions emerging from ....
Yannis Tzitzikas, Nicolas Spyratos and Panos Constantopoulos, "Mediators over Ontology-based Information Sources", in: Second International Conference on Web Information Systems Engineering (WISE 2001), Kyoto, Japan, (2001).
An Algebraic Approach for Specifying Compound.. - Tzitzikas.. (2003) Self-citation (Tzitzikas Spyratos Constantopoulos) (Correct)
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Yannis Tzitzikas, Nicolas Spyratos, and Panos Constantopoulos. "Mediators over Ontology-based Information Sources". In Second International Conference on Web Information Systems Engineering, WISE 2001.
Mediators over Ontology-based Information Sources - Tzitzikas, Spyratos.. (2001) (1 citation) Self-citation (Tzitzikas Spyratos Constantopoulos) (Correct)
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Y. Tzitzikas, N. Spyratos, and P. Constantopoulos. "Mediators over Ontology-based Information Sources", 2001. (submitted for publication).
An Algebraic Approach for Specifying Compound.. - Tzitzikas.. (2003) Self-citation (Tzitzikas Spyratos Constantopoulos) (Correct)
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Yannis Tzitzikas, Nicolas Spyratos, and Panos Constantopoulos. "Mediators over Ontology-based Information Sources". In Second International Conference on Web Information Systems Engineering, WISE 2001.
Query Evaluation in Peer-to-Peer Networks of Taxonomy-based.. - Tzitzikas, Meghini (2003) Self-citation (Tzitzikas) (Correct)
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Y. Tzitzikas, N. Spyratos, and P. Constantopoulos. "Mediators over Ontologybased Information Sources". In Second International Conference on Web Information Systems Engineering, WISE 2001, Kyoto, Japan, December 2001.
Taxonomy-based Conceptual Modeling for Peer-to-Peer Networks - Tzitzikas, Meghini.. (2003) Self-citation (Tzitzikas Spyratos) (Correct)
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Y. Tzitzikas, N. Spyratos, and P. Constantopoulos. "Mediators over Ontology-based Information Sources". In WISE'2001, Kyoto, Japan, December 2001.
Extended Faceted Taxonomies for Web Catalogs - Tzitzikas, Spyratos.. (2002) Self-citation (Tzitzikas Spyratos Constantopoulos) (Correct)
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Y. Tzitzikas, N. Spyratos, and P. Constantopoulos. "Mediators over Ontology-based Information Sources". In Second International Conference on Web Information Systems Engineering, WISE 2001.
Ostensive Automatic Schema Mapping for Taxonomy-Based.. - Tzitzikas, Meghini (2003) (4 citations) Self-citation (Tzitzikas) (Correct)
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Yannis Tzitzikas, Nicolas Spyratos, and Panos Constantopoulos. "Mediators over Ontology-based Information Sources". In Second International Conference on Web Information Systems Engineering, WISE 2001, Kyoto, Japan, December 2001.
Mediators over Ontology-based Information Sources - Tzitzikas, Spyratos.. (2001) (1 citation) Self-citation (Tzitzikas Spyratos Constantopoulos) (Correct)
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Y. Tzitzikas, N. Spyratos, and P. Constantopoulos. "Mediators over Ontology-based Information Sources", 2001. (submitted for publication).
The Semantics of the Compound Term Composition Algebra - Tzitzikas, Analyti, Spyratos (2003) Self-citation (Tzitzikas Spyratos) (Correct)
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Yannis Tzitzikas, Nicolas Spyratos, and Panos Constantopoulos. "Mediators over Ontology-based Information Sources". In Proceedings of the 2nd International Conference on Web Information Systems Engineering, WISE 2001, pages 31--40, Kyoto, Japan, December 2001.
Extended Faceted Taxonomies for Web Catalogs - Tzitzikas, Spyratos.. (2002) Self-citation (Tzitzikas Spyratos Constantopoulos) (Correct)
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Y. Tzitzikas, N. Spyratos, and P. Constantopoulos. "Mediators over Ontology-based Information Sources". In Second International Conference on Web Information Systems Engineering, WISE 2001.
An Algebraic Approach for Specifying Compound.. - Tzitzikas.. (2003) Self-citation (Tzitzikas Spyratos Constantopoulos) (Correct)
No context found.
Yannis Tzitzikas, Nicolas Spyratos, and Panos Constantopoulos. "Mediators over Ontology-based Information Sources". In Second International Conference on Web Information Systems Engineering, WISE 2001.
An Algebraic Approach for Specifying Compound.. - Tzitzikas.. (2003) Self-citation (Tzitzikas Spyratos Constantopoulos) (Correct)
No context found.
Yannis Tzitzikas, Nicolas Spyratos, and Panos Constantopoulos. "Mediators over Ontology-based Information Sources". In Second International Conference on Web Information Systems Engineering, WISE 2001.
Extended Faceted Taxonomies for Web Catalogs - Tzitzikas, Spyratos.. (2002) Self-citation (Tzitzikas Spyratos Constantopoulos) (Correct)
No context found.
Y. Tzitzikas, N. Spyratos, and P. Constantopoulos. "Mediators over Ontology-based Information Sources". In Second International Conference on Web Information Systems Engineering, WISE 2001.
The Semantics of the Compound Term Composition Algebra - Tzitzikas, Analyti, Spyratos (2003) Self-citation (Tzitzikas Spyratos) (Correct)
No context found.
Yannis Tzitzikas, Nicolas Spyratos, and Panos Constantopoulos. "Mediators over Ontology-based Information Sources". In Proceedings of the 2nd International Conference on Web Information Systems Engineering, WISE 2001, pages 31--40, Kyoto, Japan, December 2001.
The Semantics of the Compound Term Composition Algebra - Tzitzikas, Analyti, Spyratos (2003) Self-citation (Tzitzikas Spyratos) (Correct)
No context found.
Yannis Tzitzikas, Nicolas Spyratos, and Panos Constantopoulos. "Mediators over Ontology-based Information Sources". In Proceedings of the 2nd International Conference on Web Information Systems Engineering, WISE 2001, pages 31--40, Kyoto, Japan, December 2001.
Query Evaluation in Peer-to-Peer Networks of Taxonomy-based.. - Tzitzikas, Meghini (2003) Self-citation (Tzitzikas) (Correct)
No context found.
Y. Tzitzikas, N. Spyratos, and P. Constantopoulos. "Mediators over Ontologybased Information Sources". In Second International Conference on Web Information Systems Engineering, WISE 2001, Kyoto, Japan, December 2001.
Ostensive Automatic Schema Mapping for Taxonomy-Based.. - Tzitzikas, Meghini (2003) (4 citations) Self-citation (Tzitzikas) (Correct)
No context found.
Yannis Tzitzikas, Nicolas Spyratos, and Panos Constantopoulos. "Mediators over Ontology-based Information Sources". In Second International Conference on Web Information Systems Engineering, WISE 2001, Kyoto, Japan, December 2001.
Taxonomy-based Conceptual Modeling for Peer-to-Peer Networks - Tzitzikas, Meghini.. (2003) Self-citation (Tzitzikas Spyratos) (Correct)
No context found.
Y. Tzitzikas, N. Spyratos, and P. Constantopoulos. "Mediators over Ontology-based Information Sources". In WISE'2001, Kyoto, Japan, December 2001.
Query Evaluation for Mediators over Web Catalogs - Tzitzikas, Spyratos.. (2002) Self-citation (Tzitzikas Spyratos Constantopoulos) (Correct)
....is determined by the kind of the underlying sources, for example we can have mediators over relational sources (e.g. see [3, 2] retrieval systems (e.g. see [8, 5] etc. A model for building mediators over ontology based sources of the kind of Web catalogs has been proposed by the authors in [6, 7]. In the present paper we study query evaluation in the model proposed in [6, 7] specifically the complexity of query answering by the mediator. 2 Sources In this paper, a source consists of an ontology and an interpretation. The ontology is a pair (T ; where T is a terminology, i.e. a set of ....
....mediators over relational sources (e.g. see [3, 2] retrieval systems (e.g. see [8, 5] etc. A model for building mediators over ontology based sources of the kind of Web catalogs has been proposed by the authors in [6, 7] In the present paper we study query evaluation in the model proposed in [6, 7], specifically the complexity of query answering by the mediator. 2 Sources In this paper, a source consists of an ontology and an interpretation. The ontology is a pair (T ; where T is a terminology, i.e. a set of names, or terms, and is a subsumption relation over T , i.e. a reflexive and ....
Yannis Tzitzikas, Nicolas Spyratos, and Panos Constantopoulos. "Mediators over Ontology-based Information Sources". In Second International Conference on Web Information Systems Engineering, WISE 2001.
Query Translation for Mediators over.. - Tzitzikas.. (2002) Self-citation (Tzitzikas Spyratos Constantopoulos) (Correct)
....change. An alternative approach for query translation which offers more operation modes is given in [23] while the optimization of query evaluation, i.e. the minimization of the number of queries that the mediator has to send to the sources in order to evaluate a user query, is described in [24]. 12 Yannis Tzitzikas et al. One can easily see that our approach allows the users of the Web to define views over the existing Web catalogs: by defining a mediator the user can use his own terminology in order to access and query several Web catalogs, specifically those parts of the catalogs ....
Yannis Tzitzikas, Nicolas Spyratos, and Panos Constantopoulos. "Mediators over Ontology-based Information Sources", December 2001. (submitted for publication in journal).
Query Translation for Mediators over.. - Tzitzikas.. (2002) Self-citation (Tzitzikas Spyratos Constantopoulos) (Correct)
....and performance overheads. In addition, full integration is a laborious task which in many cases does not pay off because the integrated ontology becomes obsolete when the involved ontologies change. An alternative approach for query translation which offers more operation modes is given in [23], while the optimization of query evaluation, i.e. the minimization of the number of queries that the mediator has to send to the sources in order to evaluate a user query, is described in [24] 12 Yannis Tzitzikas et al. One can easily see that our approach allows the users of the Web to define ....
Yannis Tzitzikas, Nicolas Spyratos, and Panos Constantopoulos. "Mediators over Ontology-based Information Sources". In Second International Conference on Web Information Systems Engineering, WISE 2001, Kyoto, Japan, December 2001.
Mediators over Ontology-based Information Sources - Tzitzikas, Spyratos.. (2001) (1 citation) Self-citation (Tzitzikas Spyratos Constantopoulos) (Correct)
....in order to bridge the heterogeneities between the unified view of the mediator and the source views. However the reasoning services for supporting the needed translations have exponential complexity as opposed to the complexity of our mediators which is clearly polynomial (see the full paper [21] for more details) Another relevant system aiming at translating queries over multiple distributed and heterogeneous ontology based sources is the system OBSERVER ( 15] 12] It employs interontology relations and the translation of queries is based on intentional and extensional properties. ....
Y. Tzitzikas, N. Spyratos, and P. Constantopoulos. "Mediators over Ontology-based Information Sources", 2001. (submitted for publication).
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