Telos: representing knowledge about information systems
ACM Transactions on Information Systems (TOIS)
Loading data into description reasoners
SIGMOD '93 Proceedings of the 1993 ACM SIGMOD international conference on Management of data
From structured documents to novel query facilities
SIGMOD '94 Proceedings of the 1994 ACM SIGMOD international conference on Management of data
Evaluating queries with generalized path expressions
SIGMOD '96 Proceedings of the 1996 ACM SIGMOD international conference on Management of data
Reasoning in description logics
Principles of knowledge representation
Accessing distributed cultural heritage information
Communications of the ACM
An Optimal Cache for a Federated Database System
Journal of Intelligent Information Systems
Description logics for conceptual data modeling
Logics for databases and information systems
The Aquarelle resource discovery system
Computer Networks and ISDN Systems - Special issue: advanced electronic publishing
Semantic integration of semistructured and structured data sources
ACM SIGMOD Record
Information Retrieval: Application Service Definition and Protocol Specification, Z39.50-1995
Information Retrieval: Application Service Definition and Protocol Specification, Z39.50-1995
Description Logics in Data Management
IEEE Transactions on Knowledge and Data Engineering
Queries, Rules and Definitions as Epistemic Sentences in Concept Languages
Foundation of Knowledge Representation and Reasoning [the book grew out of an ECAI-92 workshop]
Querying Heterogeneous Information Sources Using Source Descriptions
VLDB '96 Proceedings of the 22th International Conference on Very Large Data Bases
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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 information as a flat list of fields, called Access Points (AP). One of the major issues for building Z39.50 wrappers is to map this unstructured list of APs to the underlying source data. Unfortunately, existing Z39.50 wrappers have been developed from scratch and they do not provide high-level mapping languages with veriffiable properties. In this paper, we propose a Description Logic based toolkit for the declarative specification of Z39.50 wrappers. We claim that the conceptualization of AP mappings enables a formal validation of the query translation quality and therefore ensures the quality of the retrieved data. Finally, it allows to tackle a number of Z39.50 pending issues (e.g., metadata retrieval, query failures due to unsupported APs, etc.) by enriching the generated Z39.50 wrappers with a number of added-value services such as conceptual structuring of flat Z39.50 vocabularies and intelligent Z39.50 query assists.