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Incremental Validation of RDF Graphs
With the scale of RDF graph data dramatically increasing, the demands for specifying constraints on RDF graphs and detecting violations of such...
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A data distribution model for RDF
The ever-increasing amount of RDF data made available requires data to be partitioned across multiple servers. We have witnessed some research...
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Compacting frequent star patterns in RDF graphs
Knowledge graphs have become a popular formalism for representing entities and their properties using a graph data model, e.g., the Resource...
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Towards Query Processing over Heterogeneous Federations of RDF Data Sources
A federation of RDF data sources offers enormous potential when answers or insights of queries are unavailable via a single data source. As various...
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Never Mind the Semantic Gap: Modular, Lazy and Safe Loading of RDF Data
Any attempt at a tight integration between semantic technologies and object oriented programming will invariably stumble over the gap between the two...
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Self-verifying Web Resource Representations Using Solid, RDF-Star and Signed URIs
Our demo showcases a Solid-based Web where the integrity of a Web resource’s representation is directly verifiable using its content and its...
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Easy and Complex: New Perspectives for Metadata Modeling Using RDF-Star and Named Graphs
The Resource Description Framework is well-established as a lingua franca for data modeling and is designed to integrate heterogeneous data at...
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RDF graph summarization for first-sight structure discovery
To help users get familiar with large RDF graphs, RDF summarization techniques can be used. In this work, we study quotient summaries of RDF graphs,...
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It’s Too Noisy in Here: Using Projection to Improve Differential Privacy on RDF Graphs
Differential privacy is one of the most popular and prevalent definitions of privacy, providing a robust and mathematically rigid definition of...
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A Review of SHACL: From Data Validation to Schema Reasoning for RDF Graphs
We present an introduction and a review of Shapes Constraint Language (shacl), the W3C recommendation language for validating rdf data. A shacl...
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Applying Grammar-Based Compression to RDF
Data compression for RDF knowledge graphs is used in an increasing number of settings. In parallel to this, several grammar-based graph compression...
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Working with RDF triples and worlds
In this chapter, we will see how to directly access Owlready’s RDF quadstore and how to create several isolated “worlds”, each having their own...
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Diversified spatial keyword search on RDF data
The abundance and ubiquity of RDF data (such as DBpedia and YAGO2) necessitate their effective and efficient retrieval. For this purpose, keyword...
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Universal Storage Adaption for Distributed RDF-Triple Stores
The publication of machine-readable information has been significantly increasing both in the magnitude and complexity of the embedded relations. The...
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PCSG: Pattern-Coverage Snippet Generation for RDF Datasets
For reusing an RDF dataset, understanding its content is a prerequisite. To support the comprehension of its large and complex structure, existing...
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The Evolution of Context-Aware RDF Knowledge Graphs
The many benefits of knowledge graphs using or based on the Resource Description Framework (RDF) well justify the utilization and wide deployment of...
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Lifting Tabular Data to RDF: A Survey
Tabular data formats (e.g. CSV and spreadsheets) combine ease of use, versatility and compatibility with information management systems. Despite...
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OntoSP: Ontology-Based Semantic-Aware Partitioning on RDF Graphs
With the development of the Semantic Web, more and more fields construct and publish their domain knowledge in RDF format. Facing the challenge of...
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FedAggs: Optimizing Aggregate Queries Evaluation in Federated RDF Systems
With the increasing scale of RDF datasets and the security requirements of data management, federated RDF systems are becoming a research hotspot....