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Searching for authors named "Yannis Velegrakis" – sorted by Relevance.

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  • Declarative Specification of Z39.50 Wrappers using Description Logics  
  • by Yannis Velegrakis, Vassilis Christophides, Panos Constantopoulos — 1998 — Computer Science Institute
  • …Abstract. Z39.50 is a client/server protocol widely used in digital libraries and museums for searching and retrieving information spread over a number of heterogeneous sources. To overcome semantic and schematic discrepancies among the various data sources the protocol relies on a world view of inf…
  • Cited by 2 (2 self) – Add To MetaCart
  • Comparing and Evaluating Mapping Systems  
  • by Bogdan Alexe, Wang-Chiew Tan, Yannis Velegrakis — 2008
  • …Schema mappings are fundamental building blocks in many information integration applications. Designing mappings is a timeconsuming process and for that reason many mapping systems have been developed to assist in the task of designing mappings. However, to the best of our knowledge, a benchmark for…
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  • Entity Identification on the Semantic Web  
  • by Alexis Morris, Yannis Velegrakis, Paolo Bouquet
  • …Abstract. In the core of every information integration and data exchange effort lies the ability to identify whether two pieces of information refer to the same real world entity. This ability is of paramount importance for all those applications and systems currently operating in the highly heterog…
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  • Mapping Adaptation under Evolving Schemas  
  • by Yannis Velegrakis Renee, Yannis Velegrakis, Renée J. Miller, Lucian Popa — 2003 — In VLDB
  • …To achieve interoperability, modern information systems and e-commerce applications use mappings to translate data from one representation to another. In dynamic environments like the Web, data sources may change not only their data but also their schemas, their semantics, and their query capab…
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  • Preserving Mapping Consistency under Schema Changes  
  • by Yannis Velegrakis, Renée J. Miller, Lucian Popa — 2004 — The VLDB Journal
  • …Abstract. In dynamic environments like the Web, data sources may change not only their data but also their schemas, their semantics, and their query capabilities. When a mapping is left inconsistent by a schema change, it has to be detected and updated. We present a novel framework and a tool (ToMAS…
  • Cited by 15 (3 self) – Add To MetaCart
  • Adapting Mappings in Frequently Changing Environments  
  • by Yannis Velegrakis, Renee J. Miller, Lucian Popa — 2003
  • …To achieve interoperability, modern information systems and e-commerce applications use mappings to translate data from one representation to another. In dynamic environments like the Web, data sources may change not only their data but also their schemas, their semantics, and their query capabili…
  • Cited by 2 (2 self) – Add To MetaCart
  • Co-located with 6th International Conference on Service Oriented Computing (ICSOC)  
  • by Farouk Toumani, Yannis Velegrakis (eds — 2008
  • …Proceedings Sponsor: IBM Research, USACopyright c○2008 for the individual papers by the papers ’ authors. Copying permitted for private and academic purposes. Re-publication of material from this volume requires permission by the copyright owners. Preface Service oriented computing (SOC) has rapidly…
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  • Mapping Adaptation under Evolving Schemas  
  • by Yannis Velegrakis, Renée J. Miller, Lucian Popa — 2003 — IN VLDB
  • …To achieve interoperability, modern information systems and e-commerce applications use mappings to translate data from one representation to another. In dynamic environments like the Web, data sources may change not only their data but also their schemas, their semantics, and their query capab…
  • Cited by 34 (5 self) – Add To MetaCart
  • Tomas: a system for adapting mappings while schemas evolve  
  • by Yannis Velegrakis, Renée J. Miller, Lucian Popa, John Mylopoulos — In: Proceedings of the Twentieth International Conference on Data Engineering
  • …A broad variety of data is available on the Web in distinct heterogeneous sources, stored under different formats: database formats (relational), document formats (SGML/XML), browser formats (HTML), scientific data, etc. Merging and coalescing data from such sources continues to be an important prob…
  • Cited by 2 (0 self) – Add To MetaCart
  • Declarative Specification of Z39.50 Wrappers  
  • by Using Description Logics, Yannis Velegrakis Y, Vassilis Christophides, Panos Constantopoulos
  • …Z39.50 is a client/server protocol widely used in digital libraries and museums for searching and retrieving information spread over a number of heterogeneous sources. Toovercome semantic and schematic discrepancies among the various data sources the protocol relies on a world view of information…
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