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Št. zadetkov: 8
A Context-Based Semantics for SPARQL Property Paths over the Web
Olaf Hartig
Video in druga učna gradiva
Oznake: computer science;big data;semantic 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 pa ...
Leto: 2015 Vir: videolectures.net
LDQL: A Query Language for the Web of Linked Data
Olaf Hartig
Video in druga učna gradiva
Oznake: computer science;semantic web
The Web of Linked Data is composed of tons of RDF documents interlinked to each other forming a huge repository of distributed semantic data. Effectively querying this distributed data source is an important open problem in the Semantic Web area. In this paper, we propose LDQL, a declarative lang ...
Leto: 2015 Vir: videolectures.net
Zero-Knowledge Query Planning for an Iterator Implementation of Link Traversal Based Query Execution
Andreas Harth , Olaf Hartig
Video in druga učna gradiva
Oznake: computer science;web mining
Link traversal based query execution is a new query execution paradigm for the Web of Data. This approach allows the execution engine to discover potentially relevant data during the query execution and, thus, enables users to tap the full potential of the Web. In earlier work we propose to implemen ...
Leto: 2011 Vir: videolectures.net
Access Control for HTTP Operations on Linked Data
Olaf Hartig , Luca Costabello
Video in druga učna gradiva
Oznake: computer science;semantic web;big data
Access control is a recognized open issue when interacting with RDF using HTTP methods. In literature, authentication and authorization mechanisms either introduce undesired complexity such as SPARQL and ad-hoc policy languages, or rely on basic access control lists, thus resulting in limited policy ...
Leto: 2013 Vir: videolectures.net
Bio2RDF Release 2: Improved coverage, interoperability and provenance of Life Science Linked Data
Olaf Hartig , Michel Dumontier
Video in druga učna gradiva
Oznake: computer science;semantic web;big data
Bio2RDF currently provides the largest network of Linked Data for the Life Sciences. Here, we describe a significant update to increase the overall quality of RDFized datasets generated from open scripts powered by an API to generate registry-validated IRIs, dataset provenance and metrics, SPARQL en ...
Leto: 2013 Vir: videolectures.net
A Systematic Investigation of Explicit and Implicit Schema Information on the Linked Open Data Cloud
Olaf Hartig , Thomas Gottron
Video in druga učna gradiva
Oznake: computer science;semantic web;big data
Schema information about resources in the Linked Open Data (LOD) cloud can be provided in a twofold way: it can be explicitly defined by attaching RDF types to the resources. Or it is provided implicitly via the definition of the resources’ properties. In this paper, we present a method and metrics ...
Leto: 2013 Vir: videolectures.net
Observing Linked Data Dynamics
Olaf Hartig , Tobias Käfer
Video in druga učna gradiva
Oznake: computer science;semantic web;big data
In this paper, we present the design and first results of the Dynamic Linked Data Observatory: a long-term experiment to monitor the two-hop neighbourhood of a core set of eighty thousand diverse Linked Data documents on a weekly basis. We present the methodology used for sampling the URIs to monito ...
Leto: 2013 Vir: videolectures.net
How to Publish Linked Data on the Web
Tom Heath , Michael Hausenblas , Christian Bizer , Richard Cyganiak , Olaf Hartig
Video in druga učna gradiva
Oznake: computer science;semantic web
The Web is increasingly understood as a global information space consisting not just of linked documents, but also of Linked Data. The Linked Data principles provide a basis for realizing this Web of Data, or Semantic Web. Since early 2007 numerous data sets have been published on the Web according ...
Leto: 2008 Vir: videolectures.net
Št. zadetkov: 8
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