Results 191 to 200 of about 174,735 (242)
RDF-Based Schema Mediation for Database Grid [PDF]
Fifth IEEE/ACM International Workshop on Grid Computing, 2005 In presence of Grid where a huge amount of databases can be involved in sharing cycle, database tools and middlewares should be well suited for schema mediation and query processing in a semantically meaningful way. Dart is an implemented prototype system whose goal is to provide a semantic solution for database resource sharing capable of deployment ...
Yuxing Mao +3 more
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Revealing the Conceptual Schemas of RDF Datasets
2019RDF-based datasets, thanks to their semantic richness, variety and fine granularity, are increasingly used by both researchers and business communities. However, these datasets suffer a lack of completeness as the content evolves continuously and data contributors are loosely constrained by the vocabularies and schemes related to the data sources ...
Issa, Subhi +3 more
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Scalable Schema Discovery for RDF Data
2020The semantic web provides access to an increasing number of linked datasets expressed in RDF. One feature of these datasets is that they are not constrained by a schema. Such schema could be very useful as it helps users understand the structure of the entities and can ease the exploitation of the dataset.
Zoubida Kedad +2 more
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Incremental Schema Discovery at Scale for RDF Data
2021The lack of a descriptive schema for an RDF dataset has motivated several research works addressing the problem of automatic schema discovery. The goal of these approaches is to generate a structural schema of a given RDF dataset from its instances. However, as new instances are added, the generated schema may become inconsistent with the dataset.
Redouane Bouhamoum +2 more
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An unsupervised instance matcher for schema-free RDF data
Journal of Web Semantics, 2015This article presents an unsupervised system that performs instance matching between entities in schema-free Resource Description Framework (RDF) files. Rather than relying on domain expertise or manually labeled samples, the system automatically generates its own heuristic training set.
Mayank Kejriwal, Daniel P. Miranker
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Schema Discovery in RDF Data Sources
2015The Web has become a huge information space consisting of interlinked datasets, enabling the design of new applications. The meaningful usage of these datasets is a challenge, as it requires some knowledge about their content such as their types and properties. In this paper, we present an automatic approach for schema discovery in RDF(S)/OWL datasets.
Kenza Kellou-Menouer, Zoubida Kedad
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A Transformation from RDF Documents and Schemas to Relational Databases
2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, 2007At present, resource description framework (RDF) documents and schemas (RDFS) are used to describe information in the semantic Web. Many research works regard the RDF/RDFS documents as databases and proposed data manipulations for them. This research paper takes a different approach.
W. Teswanich, S. Chittayasothorn
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Disjunctive Constraints in RDF and Their Application to Context Schemas
2014RDF is a data model whose relevance is growing in the last years. Recently, some proposals have enriched the model with integrity constraints, well known within relational databases. In this work we extend an existing framework with two new types of integrity constraints of disjunctive nature, inspired by similar kinds of dependencies studied for the ...
RABOSIO, EMANUELE +2 more
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PoweRGen: A power-law based generator of RDFS schemas
Information Systems, 2012As the amount of RDF datasets available on the Web has grown significantly over the last years, scalability and performance of Semantic Web (SW) systems are gaining importance. Current RDF benchmarking efforts either consider schema-less RDF datasets or rely on fixed RDFS schemas.
George F. Georgakopoulos +2 more
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Investigating Schema Definitions Using RDFS and OWL 2 for RDF Databases in Life Sciences
2020With the development of measuring instruments, life science databases are becoming larger and more heterogeneous. As a step towards providing integrated databases, many life science databases have been published as Linked Open Data (LOD). To utilize such databases efficiently, it is desirable that the schema, such as class–class relations, can be ...
Atsuko Yamaguchi +3 more
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