This paper is a survey of the research topics in the field of Semantic Web, Linked Data and
Web of Data. This study looks at the contributions of this research community over its first …

The new Semantic Web recommendations for RDF, RDFS and OWL have, at their heart, the
RDF graph. Jena2, a second-generation RDF toolkit, is similarly centered on the RDF graph …

Public and private organizations have access to a vast amount of internal, deep Web and
open Web information. Transforming this heterogeneous and distributed information into …

One of the original motivations behind ontology research was the belief that ontologies can
help with reuse in knowledge representation. However, many of the ontologies that are …

A number of techniques have been developed to facilitate powerful data retrieval on the
Web and Semantic Web. Three categories of Web query languages can be distinguished …

Real-world use of RDF requires the ability to transparently represent and explain metadata
associated with RDF triples. For example, when RDF triples are extracted automatically by …

Building user-friendly GUIs for browsing and filtering RDF/S description bases while
exploiting in a transparent way the expressiveness of declarative query/view languages is …

One of the main hurdles towards a wide endorsement of ontologies is the high cost of
constructing them. Reuse of existing ontologies offers a much cheaper alternative than …

RDF/XML does not layer RDF on top of XML ina useful way. We use a simple direct
representation of the RDF abstract syntax in XML. We add the ability to name graphs, noting …

This article is firstly an introduction into query languages for the Semantic Web, secondly an
in-depth comparison of the languages introduced. Only RDF query languages are …