Exploring Graphs with Elixir

Case #3: Graph Walk (Browsing)

Let’s build a small toy—a linked data explorer. We’re going to look up Wikipedia links in DBpedia and see if there’s a link from one Wikipedia page to another. We can then follow our nose and see if that link is linked to another Wikipedia page, and so on.

Create a new walk_links.ex file under the rdf_graph/lib/rdf_graph/examples/ folder:

.
├── rdf_graph
│   ├── examples
│   │   ├── walk_links.ex
│   │   └── walk_query.ex
│   ├── service.ex
│   └── vocab.ex
└── rdf_graph.ex

And create a new module:

defmodule RDFGraph.Examples.WalkLinks do
  use Tesla

  # ...

end

Note that we add a use Tesla macro as we’ll be using the Tesla framework for HTTP requests.

We can then add a couple of middleware ...