A crucial factor in the adoption of the Web of Data consists in the possibility of obtaining access to the published resources. However, this access is not always simple, constrained by languages and templates that are sub-optimal for application development. As a consequence, recent initiatives such as EasierRDF and LDFlex are strongly pushing the proposal of new solutions for making Semantic data on the Web developer friendly.
The goal of this tutorial is to give participants sufficient knowledge for:
- understanding the landscape of mature, production-ready and industry-grade technological solutions for publishing Web APIs on top of RDF datasets;
- republishing RDF data through Web API, to increase the use and adoption of RDF datasets, even outside the Semantic Web community;
- retrieving data from SPARQL endpoints in a more practical format to be used in small proofs-of-content, living software or interactive notebooks (i.e. Jupyter), minimising the effort for accessing data.
This half-day tutorial will be composed of two parts, consisting each of slides and hands-on exercises:
- The second part will cover the publication of Web API on top of SPARQL endpoints. Different specification – e.g. smartAPI, Linked Data API specification, OpenAPI – and services – e.g. BASIL – for describing RESTful APIs will be introduced to the audience . Then, we will show the grlc application and explain the different part of the framework: the GitHub repository, the self-generated UI and the automatically exposed API. The public will then publish their own API in the second hands-on session. Finally, we will introduce the integration of SPARQL Transformer in grlc and we will conclude the tutorial with a summary of the covered topics.
This tutorial will take place on April 12th, 2021. The participants will receive the link from the conference organisers.
The schedule is the following, in CEST (Ljubljana) Timezone :
|14.00 - 14.10||Introduction|
|14.10 - 14.30||Overview: libraries for accessing RDF data|
|14.30 - 15.00||SPARQL Transformer|
|15.00 - 15.20||SPARQL Transformer hands-on|
|15.20 - 15.50||break|
|15.50 - 16.10||Overview: Web API for RDF|
|16.10 - 16.30||grlc|
|16.30 - 16.50||grlc hands-on|
|16.50 - 16.55||SPARQL Transformer and grlc|
|16.55 - 17.00||Discussion and closing|
This tutorial is directed to anyone who works with RDF data and SPARQL, and in particular is interested in providing quick access to the data and/or Web APIs on top of them. For the hands-on session, the participants are expected to use a computer with a web browser installed and to have a personal GitHub account (You haven’t one? Create it for free).
We assume that most participants will be familiar with basic Semantic Web technologies (RDF, SPARQL). The tutorial aims to provide them a general know-how and practical information for developing Web APIs on top of SPARQL endpoints. In addition, the participants will obtain competence in using the presented technologies and will be immediately able to apply them to their work, also thanks to the hands-on session.
- Pasquale Lisena, Albert Meroño-Peñuela, Tobias Kuhn and Raphaël Troncy. Easy Web API Development with SPARQL Transformer. In 18th International Semantic Web Conference (ISWC), Auckland, New Zealand, October 26-30, 2019.
- Albert Meroño-Peñuela, Rinke Hoekstra.
grlcMakes GitHub Taste Like Linked Data APIs. In The Semantic Web – ESWC 2016 Satellite Events, Heraklion, Crete, Greece, May 29 – June 2, 2016.
Photo credit: Thomas Claveirole