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(Research report / Forskningsrapport, 2017)
We present a representation of spatial data that supports answering of qualitative queries (involving e.g. containment and overlap), using less time than numerical computations on coordinates, and less space than explicitly ...
(Research report / Forskningsrapport, 2017)
The concrete problem this paper addresses is the following: Given a set of objects with a spatial interpretation and a set of qualitative relations, construct a bintree representation that returns the same answers to queries ...
(Research report / Forskningsrapport, 2023)
This technical reports contains the papers of the Workshop on Ap- plications of Formal Methods and Digital Twins, which is held 06.03.23 in Lübeck, Germany, co-located with the 25th International Symposium on Formal Methods. ...
(Research report / Forskningsrapport, 2023)
We propose a set of optimizations that can be applied to a given SPARQL query, and that guarantee that the optimized query has the same answers under bag semantics as the original query, provided that the queried RDF graph ...
(Research report / Forskningsrapport, 2021)
Most of the existing structured digital information today is still stored in relational databases. That’s why it is important for the Semantic Web effort to expose the information in relational databases as RDF, or allow ...
(Research report / Forskningsrapport, 2021)
We propose a novel integration of programming languages with semantic technologies. We create a semantic reflection mechanism by a direct mapping from program states to RDF knowledge graphs. This mechanism enables several ...
(Research report / Forskningsrapport, 2021)
Most of the existing structured digital information today is still stored in relational databases. That’s why it is important for the Semantic Web effort to expose the information in relational databases as RDF, or allow ...
(Research report / Forskningsrapport, 2022)
Most structured data today is still stored in relational databases, which makes it important to provide a translation between relational and semantic data. A relational to RDF mapping, such as R2RML [14], provides a way ...
(Research report / Forskningsrapport, 2022)
Any attempt at a tight integration between semantic technologies and object oriented programming will invariably stumble over the gap between the two underlying object models. We illustrate how this semantic gap manifests ...