While OpenRefine allows you out-of-the-box to add new reconciliation services, these are only services that work in a certain way under the hood. However, there are several other types of services out there, and if you want to use them, you will need to add some functionality to OpenRefine in the form of extensions. So, before we can show you how to add those services, we first have to explain how to install OpenRefine extensions. Not all extensions offer reconciliation services, so this recipe describes the general installation procedure. At the time of writing, several OpenRefine extensions are available, including the following points:
The RDF extension by Digital Enterprise Research Institute (DERI), which adds support for RDF export and reconciliation with SPARQL endpoints. We'll explain both terms in the next recipe.
The Named-Entity Recognition (NER) extension written by one of the authors of this book, which allows you to extract URLs from full-text...