The W3C Generating RDF from Tabular Data on the Web Recommendation provides a mechanism for mapping CSV-formatted data to any graph model. Since Wikibase model used by Wikidata can be expressed as RDF, this document tabular snapshots of parts knowledge in simple form that is easy humans and applications read. Those how subgraphs have changed over time compared with current state using its Query...

In this paper, we introduce a benchmark to test efficiency of RDF data model for data storage and querying in relation to a concrete dataset. We created Czech DBpedia a freely available dataset composed of data extracted from Czech Wikipedia. But during creation and querying of this dataset, we faced problems caused by a lack of performance of used RDF storage. We designed metrics to measure ef...

Named graphs are likely to be at the forefront of any future revisions of the RDF data model. The ability to assert metadata about a graph is essential to provenance tracking, access control, and overall data management in the Semantic Web domain. If named graphs were to be incorporated into RDF, it follows that Linked Data would support named graphs at a basic level. This paper investigates po...

The Resource Description Framework (RDF) provides a common data model for the integration of “real-time” social and sensor data streams with the Web and with each other. While there exist numerous protocols and data formats for exchanging dynamic RDF data, or RDF updates, these options should be examined carefully in order to enable a Semantic Web equivalent of the high-throughput, low-latency ...

The Linguistic Annotation Framework defines a generalised graph based model for annotation data intended as an interchange format for transfer of annotations between tools. The DADA system uses an RDF based representation of annotation data and provides a web based annotation store. The annotation model in DADA can be seen as an RDF realisation of the LAF model. This paper describes the relatio...

Abstract One of the main obstacles in publishing a Linked Data way is to connect dataset being published externally with related data sources cloud, known as Interlinking. This paper proposes LinkD, new element-based interlinking approach. LinkD interlinks an RDF dataset, resulted from transformed semi-structured data, its counterparts web Data. To provide similarity links, existence cloud done...

In order to effectively handle the growing amount of available RDF data, scalable and flexible RDF data processing frameworks are needed. While emerging technologies for Big Data, such as Hadoop-based systems that take advantages of scalable and fault-tolerant distributed processing, based on Google’s distributed file system and MapReduce parallel model, have become available, there are still m...

The Resource Description Framework (RDF) is the fundamental data model underlying the Semantic Web. Recently, SPARQL has been proposed as W3C standard for querying RDF repositories. As RDF is a graph-based data model, the core problem of evaluating SPARQL queries is matching query graph patterns against the data graph, which is computationally very expensive. We address this problem by indexing...

In this paper we present RDFauthor, an approach for authoring information that adheres to the RDF data model. RDFauthor completely hides syntax as well as RDF and ontology data model difficulties from end users and allows to edit information on arbitrary RDFaannotated web pages. RDFauthor extends RDFa with representations for provenance and update endpoint information. RDFauthor is based on ext...

The general research question addressed in this paper is How to transform RDF into other languages. This is of prime interest to present data selected and extracted from the Web of data in a format suitable for the user (e.g., HTML or CSV). Moreover, RDF can be viewed as a meta-model to represent on the Web of data other languages and models. The above research question then becomes How to gene...