0 to 60 on SPARQL Queries in 50 Minutes
This webinar provides an introduction to SPARQL, a query language for RDF. Users will gain hands on experience crafting queries, starting simply, but evolving in [...]
Validating RDF Data
This book describes two languages for implementing constraints on RDF data, describing the main features of both Shape Expressions (ShEx) and Shapes Constraints Language (SHACL) [...]
Open Refine 101
This free online course explains that while data cleaning, preparation and enrichment take up an enormous amount of time, and is nevertheless a crucial stage [...]
Swagger, the API Economy, REST, Linked Data, and a Semantic Web
In this blog post, the author presents the following situation analysis: The network commonly referred to as the World Wide Web (“Web”) is built upon [...]
Using the Convert CSV to RDF ingest tool
This guide will walk through the use of the Convert CSV to RDF tool, a semi-automated method of converting comma separated or tab separated text [...]
Don’t Use a Hammer to Screw in a Nail: Alternatives to REGEX in SPARQL
This brief blog post explains that regular expressions are expensive to evaluate regardless of what language you are using them in. The author suggests that [...]
Equality and Inequality in SPARQL
This brief blog post discusses issues surrounding expression semantics in SPARQL. Practices that people are used to from other languages (like the use of "=" [...]
Converting Relational Data Into RDF Format
This tutorial shows two different methods of converting or materializing relational data into RDF graph data format: the D2RQ based method and the SQL based [...]
Using the SPARQL Package in R to Handle Spatial Linked Data: Part II
Continuing where Part I left off, this tutorial shows how to access Spatial and Temporal Data about the complex environmental system of the Brazilian Amazon [...]
Using the SPARQL Package in R to Handle Spatial Linked Data: Part I
As a solution to bridge two communities, those of statistical computing and the Semantic Web, there is now the SPARQL Package for R, which enables [...]