Exploring Graphs with Elixir

Case #2: Graph Walk (Querying)

The first thing we’ll do is create a new module. Create a new folder examples/ under our rdf_graph/lib/rdf_graph/ folder and under that create a walk_query.ex file.

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

Then create a new module:

defmodule RDFGraph.Examples.WalkQuery do

  # ...

end

Now add in a walk_query/2 function as follows:

apps/rdf_graph/lib/rdf_graph/examples/walk_query.ex

def walk_query(link \\ "http://dbpedia.org/resource/Bob_Dylan", count \\ 0)    
def walk_query(_, count) when count >= 7, do: :ok    

def walk_query(link, count) do
  IO.puts link
  query =     
  ~S"""
 PREFIX dbo: <http://dbpedia.org/ontology/> ...