Tag: RDF

QuickGraph#19 Taxonomy reconciliation

A few months ago I gave a presentation in the Connections: Life Sciences & Healthcare virtual event. It was about building a Knowledge Graph using public RDF resources. You can watch the recording here or even reproduce the whole session following the instructions in this repository.

I went through the content again recently and I found one particular bit of that session that was specially interesting and worth spending a QuickGraph on. I’m talking of course of the reconciliation of taxonomies. Let’s dive in.

Continue reading “QuickGraph#19 Taxonomy reconciliation” →

QuickGraph#8 revisited: LossLess graph copy between Neo4j DBs with RDF-star

Roughly a year and a half ago I posted QuickGraph#8 on how to copy all or part of your graph between neo4j DBs by serialising it as RDF with Neosemantics. It concluded on a sad note though, something along these lines: “Relationship properties will be lost in this process because RDF does not allow the representation of properties in edges”. Well, now we have RDF-star and the problem is solved. This is a brief update to that post where I explain how to overcome that hurdle.

Continue reading “QuickGraph#8 revisited: LossLess graph copy between Neo4j DBs with RDF-star” →

QuickGraph#16 The English WordNet in Neo4j (part 1)

English WordNet is a representation of the English language a lexical network. It groups words into synsets and links them according to semantic relationships such as hypernymy, antonymy and meronymy. You can actually browse through its content from the English Wordnet website. Wordnet is often used in natural language processing (NLP) applications (but also many others) and provides deep lexical information about the English language as a graph. As a graph… that sounds interesting, definitely worth a QuickGraph.

Because this is a particularly rich case I’ll break it down in at least two instalments. In the first one I’ll explain the construction of the graph in Neo4j and in the second one I’ll show some interesting ways of using it. I hope you’ll enjoy it.

Continue reading “QuickGraph#16 The English WordNet in Neo4j (part 1)” →

QuickGraph#15 Analysing the structured data embedded in web pages

You’ve probably heard that there are billions of pages on the web that embed structured data describing products, events, people, organisations… One of the most popular mechanisms for doing this is JSON-LD which is one of the many ways of serialising triples. Since you’re here, I’m sure you know that triples form graphs and that I like exploring graphy things…

In this QuickGraph I’ll have a look at the brand new White House pages and use Neo4j and neosemantics to analyse the structured data they embed.

Continue reading “QuickGraph#15 Analysing the structured data embedded in web pages” →

QuickGraph#13 Using a SKOS taxonomy for semantic search on a document repository

The TESEO database is an online repository containing the details of all PhD thesis from Spanish universities. It offers an html/form based search interface where you can look up theses by author, topic, university, etc. As a UI it is rather painful to use and quite limited, I must say, but that’s another story. While we wait for an open data version of this public content we have to find workarounds to query and analyse it. This is what this QuickGraph is about.

Continue reading “QuickGraph#13 Using a SKOS taxonomy for semantic search on a document repository” →

QuickGraph#12 Working with a Multilingual Thesaurus

The UNESCO Thesaurus is a controlled and structured list of terms in the areas of education, culture, natural sciences, social and human sciences, communication and information. It’s used used to annotate documents and publications like the ones in the UNESDOC digital library.

The Thesaurus is available as a multilingual SKOS concept scheme and at the time of writing, the available languages were English, Spanish, French, Russian and Arabic (download link).

Continue reading “QuickGraph#12 Working with a Multilingual Thesaurus” →

QuickGraph#10 Enrich your Neo4j Knowledge Graph by querying Wikidata

Wikidata is a collaboratively edited knowledge base. It is a source of open data that you may want to use in your projects. Wikidata offers a query service for integrations. In this QuickGraph, I will show how to use the Wikidata Query Service to get data into Neo4j. Continue reading “QuickGraph#10 Enrich your Neo4j Knowledge Graph by querying Wikidata” →

QuickGraph#9 The fashion Knowledge Graph. Inferencing with Ontologies in Neo4j

Last winter I had the opportunity to meet Katariina Kari at a Neo4j event in Helsinki. We had a conversation about graphs, RDF, LPG… we agreed on some things… and disagreed on others 🙂 but I remember telling her that I had found very interesting a post she had published on how they were using Ontologies to drive semantic searches on the Zalando web site.

I’ll use her example from that post and show how you can implement semantic searches/recommendations in Neo4j and leverage existing Ontologies (public standards or your own). That’s what this QuickGraph is about.

I assume you have some level of familiarity with RDF and semantic technologies. Continue reading “QuickGraph#9 The fashion Knowledge Graph. Inferencing with Ontologies in Neo4j” →

QuickGraph#8 Cloning subgraphs between Neo4j instances with Cypher+RDF

I have two Neo4j instances: let’s call them instance-one and instance-two. My problem is simple, I want an easy way to copy fragments of the graph stored in instance-one to instance-two. In this post, I’ll explain here how to use:

  • Cypher to define the subgraph to be cloned and
  • RDF as the model for data exchange (serialisation format)

All with the help of the neosemantics plugin. Continue reading “QuickGraph#8 Cloning subgraphs between Neo4j instances with Cypher+RDF” →