Sign in or Join


Log in

­

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 [...]

By |May 5th, 2018|Comments Off on 0 to 60 on SPARQL Queries in 50 Minutes

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) [...]

By |September 15th, 2017|Comments Off on Validating RDF Data

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 [...]

By |August 25th, 2017|Comments Off on Open Refine 101

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 [...]

By |August 19th, 2017|Comments Off on Swagger, the API Economy, REST, Linked Data, and a Semantic Web

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 [...]

By |August 18th, 2017|Comments Off on Using the Convert CSV to RDF ingest tool

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 [...]

By |August 13th, 2017|Comments Off on Don’t Use a Hammer to Screw in a Nail: Alternatives to REGEX in SPARQL

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 "=" [...]

By |August 13th, 2017|Comments Off on Equality and Inequality in SPARQL

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 [...]

By |August 8th, 2017|Comments Off on Converting Relational Data Into RDF Format

SPARQL Package for R: Movie Star Graph Visualization Tutorial

The SPARQL Package allows you to directly import results of SPARQL SELECT queries into the statistical environment of R as a data frame, allowing one [...]

By |August 6th, 2017|Comments Off on SPARQL Package for R: Movie Star Graph Visualization Tutorial

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 [...]

By |August 6th, 2017|Comments Off on Using the SPARQL Package in R to Handle Spatial Linked Data: Part II