Explanipedia

GeoSPARQL+: Syntax, Semantics and System for Integrated Querying of Graph, Raster and Vector Data -- Technical Report Open

Timo Homburg, Steffen Staab, Daniel Janke · 2020

We introduce an approach to semantically represent and query raster data in a Semantic Web graph. We extend the GeoSPARQL vocabulary and query language to support raster data as a new type of geospatial data. We define new filter functions…

BeSEPPI: Semantic-Based Benchmarking of Property Path Implementations Open

Adrian Skubella, Daniel Janke, Steffen Staab · 2019

In 2013 property paths were introduced with the release of SPARQL 1.1. These property paths allow for describing complex queries in a more concise and comprehensive way. The W3C introduced a formal specification of the semantics of propert…

Compressing and Maintaining Statistics Information about Resource Occurrences in a Distributed RDF Store. Open

Daniel Janke, Steffen Staab · 2018

In distributed RDF stores triples are assigned to one or several storage and compute nodes. In order to perform query planning and optimization, statistical information about the occurrences of IRIs and literals on the individual storage a…

Storing and Querying Semantic Data in the Cloud Open

Steffen Staab, Daniel Janke · 2018

In the last years, huge RDF graphs with trillions of triples were created. To be able to process this huge amount of data, scalable RDF stores are used, in which graph data is distributed over compute and storage nodes for scaling efforts …

Impact Analysis of Data Placement Strategies on Query Efforts in Distributed RDF Stores Open

Daniel Janke, Steffen Staab, Matthias Thimm · 2018

Koral: A Glass Box Profiling System for Individual Components of Distributed RDF Stores. Open

Daniel Janke, Steffen Staab, Matthias Thimm · 2017

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