منابع مشابه
SPARQL with property paths on the Web
Linked Data on the Web represents an immense source of knowledge suitable to be automatically processed and queried. In this respect, there are different approaches for Linked Data querying that differ on the degree of centralization adopted. On one hand, the SPARQL query language, originally defined for querying single datasets, has been enhanced with features to query federations of datasets;...
متن کاملSPARQL with Property Paths
The original SPARQL proposal was often criticized for its inability to navigate through the structure of RDF documents. For this reason property paths were introduced in SPARQL 1.1, but up to date there are no theoretical studies examining how their addition to the language affects main computational tasks such as query evaluation, query containment, and query subsumption. In this paper we tack...
متن کاملTowards Query Optimization for SPARQL Property Paths
The extension of SPARQL in version 1.1 with property paths offers a type of regular path query for RDF graph databases. Such queries are difficult to optimize and evaluate efficiently, however. We have embarked on a project, Waveguide, to build a cost-based optimizer for SPARQL queries with property paths. Waveguide builds a query plan—a waveguide plan (WGP)—which guides the query evaluation. T...
متن کاملBenchmarks for SPARQL Property Paths Bachelorarbeit
The Resource Description Framework (RDF) is a triple based representation of directed graphs with labelled edges. With the emergence of RDF graphs special databases, called RDF stores, were developed. In order to query graphs, which are stored in these RDF stores, the query language SPARQL Protocol And Query Language (SPARQL) is used. With the help of this query language it is possible to descr...
متن کاملA Context-Based Semantics for SPARQL Property Paths Over the Web
As of today, there exists no standard language for querying Linked Data on the Web, where navigation across distributed data sources is a key feature. A natural candidate seems to be SPARQL, which recently has been enhanced with navigational capabilities thanks to the introduction of property paths (PPs). However, the semantics of SPARQL restricts the scope of navigation via PPs to single RDF g...
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ژورنال
عنوان ژورنال: Semantic Web
سال: 2017
ISSN: 2210-4968,1570-0844
DOI: 10.3233/sw-160237