Neo4j is your RDF store (part 1)

If you want to understand the differences and similarities between RDF and the Labeled Property Graph implemented by Neo4j, I’d recommend you watch this talk I gave at Graph Connect San Francisco in October 2016. Intro Let me start with some basics: RDF is a standard for data exchange, but it does not impose any particular way […]

QuickGraph#4 Explore your browser history in Neo4j

The dataset For this example I am going to use my browser history data. Most browsers store this data in SQLite. This means relational data, easy to access from Neo4j using the apoc.load.jdbc  stored procedure. I’m a Chrome user, and in my Mac, Chrome stores the history db at ~/Library/Application Support/Google/Chrome/Default/History There are two main tables in the […]

The ‘hidden’ connections in Google’s Knowledge Graph

As far as I know, the only way to query Google’s Knowledge Graph currently is the search API. Let’s run a query on it, search for instance for Miles Davis’ album “Sketches of Spain”. https://kgsearch.googleapis.com/v1/entities:search?query=sketches%20of%20spain&key=<your_key_here>&limit=1 The API returns this JSON-LD fragment back (thanks, Jos de Jong for the great JSON Editor Online): Strip out the wrapping entities and each search result […]

QuickGraph#3 A step-by-step example of RDF to Property Graph transformation

The dataset For this example I am going to use a sample movie dataset from the Cayley project. It’s a set of half a million triples about actors, directors and movies that can be downloaded here. Here is what the dataset looks like: </en/meet_the_parents> <name> “Meet the Parents” . </en/meet_the_parents> <type> </film/film> . </en/meet_the_parents> </film/film/directed_by> </en/jay_roach> . […]

QuickGraph#2 How is Wikipedia’s knowledge organised

The dataset For this QuickGraph I’ll use data about Wikipedia Categories. You may have noticed at the bottom of every Wikipedia article a section listing the categories it’s classified under. Every Wikipedia article will have at least one category, and categories branch into subcategories forming overlapping trees. It is sometimes possible for a category (and the Wikipedia hierarchy is an example of […]

Importing RDF data into Neo4j

The previous blog post might have been a bit too dense to start with, so I’ll try something a bit lighter this time like importing RDF data into Neo4j. It asumes, however, a certain degree of familiarity with both RDF and graph databases. There are a number of RDF datasets out there that you may […]