Results 11 to 20 of about 196,989 (264)
Enabling knowledge representation on the Web by extending RDF schema [PDF]
Computer Networks, 2001 Recently, a widespread interest has emerged in using ontologies on the Web. Resource Description Framework Schema (RDFS) is a basic tool that enables users to define vocabulary, structure and constraints for expressing meta data about Web resources. However, it includes no provisions for formal semantics, and its expressivity is not sufficient for full-
Jeen Broekstra +5 more
semanticscholar +7 more sources
A descriptive type foundation for RDF Schema [PDF]
Journal of Logical and Algebraic Methods in Programming, 2016 Abstract This paper provides a type theoretic foundation for descriptive types that appear in Linked Data. Linked Data is data published on the Web according to principles and standards supported by the W3C. Such Linked Data is inherently messy: this is due to the fact that instead of being assigned a strict a priori schema, the schema is inferred a ...
Gabriel Ciobanu +2 more
semanticscholar +8 more sources
Sesame: A Generic Architecture for Storing and Querying RDF and RDF Schema [PDF]
International Workshop on the Semantic Web, 2002 RDF and RDF Schema are two W3C standards aimed at enriching the Web with machine-processable semantic data. We have developed Sesame, an architecture for efficient storage and expressive querying of large quantities of metadata in RDF and RDF Schema. Sesame's design and implementation are independent from any specific storage device.
Jeen Broekstra +2 more
semanticscholar +5 more sources
Integrating ontologies and thesauri for RDF schema creation and metadata querying [PDF]
International Journal on Digital Libraries, 2000 In this paper we present a new approach for building metadata schemas by integrating existing ontologies and structured vocabularies (thesauri). This integration is based on the specification of inclusion relationships between thesaurus terms and ontology concepts and results in application-specific metadata schemas incorporating the structural views ...
Bernd Amann +2 more
semanticscholar +6 more sources
Semantics and Validation of Shapes Schemas for RDF [PDF]
, 2014 We present a formal semantics and proof of soundness for shapes schemas, an expressive schema language for RDF graphs that is the foundation of Shape Expressions Language 2.0. It can be used to describe the vocabulary and the structure of an RDF graph, and to constrain the admissible properties and values for nodes in that graph. The language defines a
Iovka Boneva +2 more
core +9 more sources
On Ranking RDF Schema Elements (and its Application in Visualization) [PDF]
Journal of universal computer science (Online), 2007 Ranking is a ubiquitous requirement whenever we confront a large collec- tion of atomic or interrelated artifacts. This paper elaborates on this issue for the case of RDF schemas. Specifically, several metrics for evaluating automatic methods for ranking
Yannis Tzitzikas +2 more
semanticscholar +4 more sources
Relational schema optimization for RDF-based knowledge graphs
Information Systems, 2021 Abstract Characteristic sets (CS) organize RDF triples based on the set of properties associated with their subject nodes. This concept was recently used in indexing techniques, as it can capture the implicit schema of RDF data. While most CS-based approaches yield significant improvements in space and query performance, they fail to perform well ...
George Papastefanatos +2 more
semanticscholar +4 more sources
Answering SPARQL queries modulo RDF Schema with paths [PDF]
, 2013 SPARQL est le langage de requête standard pour interroger des graphes RDF. Dans son instanciation stricte, il ne propose que des requêtes en fonction de la sémantique de RDF et n'interprète donc pas les vocabulaires exprimés en RDFS ou OWL. Plusieurs extensions de SPARQL ont été proposées pour interroger les données RDF en fonction de vocabulaires RDFS
Faisal Alkhateeb, Jérôme Euzenat
core +8 more sources
Resource Description Language RDF & RDF Schema
, 2016 Umberto Straccia
semanticscholar +4 more sources
The SPHN Schema Forge – transform healthcare semantics from human-readable to machine-readable by leveraging semantic web technologies [PDF]
Journal of Biomedical SemanticsBackground The Swiss Personalized Health Network (SPHN) adopted the Resource Description Framework (RDF), a core component of the Semantic Web technology stack, for the formal encoding and exchange of healthcare data in a medical knowledge graph.
Vasundra Touré +7 more
doaj +2 more sources