SPARQL and OWL on the command line—of my phone!
Termux and rdflib on my Android phone.
I recently wondered “could I run a Python script that includes the rdflib library on my Samsung Android phone?” Five minutes later, I was doing it, and about three of those minutes were spent installing Python.
Web3 and Web 3.0 at OriginTrail
An interview with CTO and co-founder Branimir Rakić
OriginTrail is doing one of the most interesting combinations of blockchain technology and RDF that I have seen. In November I spoke with CTO and co-founder Branimir Rakić.
SPARQL queries of git repository data
If we're going to think of git data as a graph...
Justin Dowdy recently created an open source project to convert the metadata in a git repository to RDF, and I’ve been having some fun with it. Before getting into the details, as a brief demo I’ll start with a sample SPARQL query that I did to list all of the 2019 commits in my misc github repo:
Your own free, publicly available SPARQL endpoint
Free as in tier.
There are a few tutorials out there about how to start up your own free-tier Amazon Web Services (AWS) Elastic Compute Cloud (EC2) instance and then run your own publicly available web server. I’ve planned for a while to try this with a Jena Fuseki triplestore and SPARQL endpoint, but I postponed it because I thought it might be complicated. It turned out to be pretty easy.
More Picasso paintings in one year than all the Vermeer paintings?
Answering an art history question with SPARQL.
Sometimes a question pops into my head that, although unrelated to computers, could likely be answered with a SPARQL query. I don’t necessarily know the query off the top of my head and have to work it out. I’m going to discuss an example of one that I worked out and the steps that I took, because I wanted to show how I navigated the Wikidata data model to get what I wanted.
SPARQL and Instacart's Knowledge Graph
Managing data quality.
Two recent articles describe a fascinating use of SPARQL to improve data quality in a knowledge graph at the successful grocery delivery service Instacart. On Reliability Scores for Knowledge Graphs (pdf) is a short paper submitted to the 2022 ACM Web Conference in Lyon and a longer piece on Instacart’s tech blog is titled Red Means Stop. Green Means Go: A Look into Quality Assessment in Instacart’s Knowledge Graph.
Generating websites with SPARQL and Snowman, part 2
With Rhizome's excellent ArtBase SPARQL endpoint.
In part one of this two-part series, we saw how the open source Snowman static web site generator can generate websites with data from a SPARQL endpoint. I showed how I created a sample website project with its
snowman new command and then reconfigured the project to retrieve a list of artists from the Rhizome ArtBase endpoint, a repository of data about digital artworks since 1999. Here in part two I will build on that to add lists of artists’ works with links to Rhizome pages about…