Results 1 to 10 of about 25,129 (234)
Semantics and Validation of Shapes Schemas for RDF [PDF]
arXiv, 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
arxiv +11 more sources
Answering SPARQL queries modulo RDF Schema with paths [PDF]
arXiv, 2013 SPARQL is the standard query language for RDF graphs. In its strict instantiation, it only offers querying according to the RDF semantics and would thus ignore the semantics of data expressed with respect to (RDF) schemas or (OWL) ontologies. Several extensions to SPARQL have been proposed to query RDF data modulo RDFS, i.e., interpreting the query ...
Faisal Alkhateeb, Jérôme Euzenat
arxiv +10 more sources
Rule Applicability on RDF Triplestore Schemas [PDF]
arXiv, 2019 Rule-based systems play a critical role in health and safety, where policies created by experts are usually formalised as rules. When dealing with increasingly large and dynamic sources of data, as in the case of Internet of Things (IoT) applications, it becomes important not only to efficiently apply rules, but also to reason about their applicability
Paolo Pareti +3 more
arxiv +6 more sources
Inference of Shape Expression Schemas Typed RDF Graphs [PDF]
arXiv, 2021 We consider the problem of constructing a Shape Expression Schema (ShEx) that describes the structure of a given input RDF graph. We employ the framework of grammatical inference, where the objective is to find an inference algorithm that is both sound i.e., always producing a schema that validates the input RDF graph, and complete i.e., able to ...
Benoît Groz +3 more
arxiv +5 more sources
Relational to RDF Data Exchange in Presence of a Shape Expression Schema [PDF]
arXiv, 2018 We study the relational to RDF data exchange problem, where the tar- get constraints are specified using Shape Expression schema (ShEx). We investi- gate two fundamental problems: 1) consistency which is checking for a given data exchange setting whether there always exists a solution for any source instance, and 2) constructing a universal solution ...
Iovka Boneva +2 more
arxiv +7 more sources
Mapping RDF Databases to Property Graph Databases [PDF]
IEEE Access, 2020 RDF triplestores and property graph databases are two approaches for data management which are based on modeling, storing and querying graph-like data. In spite of such common principle, they present special features that complicate the task of database ...
Renzo Angles +2 more
doaj +2 more sources
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
+7 more sources
Transforming XML to RDF(S) with Temporal Information [PDF]
Journal of Computing and Information Technology, 2018 The Resource Description Framework (RDF) is a model for representing resources on the Web. With the widespread acceptance of RDF in various applications (e.g., knowledge graph), a huge amount of RDF data is being proliferated.
Dan Yang, Li Yan
doaj +3 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
openalex +7 more sources
Assessing resolvability, parsability, and consistency of RDF resources: a use case in rare diseases [PDF]
Journal of Biomedical Semantics, 2023 Introduction Healthcare data and the knowledge gleaned from it play a key role in improving the health of current and future patients. These knowledge sources are regularly represented as ‘linked’ resources based on the Resource Description Framework ...
Shuxin Zhang +2 more
doaj +2 more sources