test_graph v0.1.0 TestGraph.RDF

Module for reading and writing a library of RDF graphs and SPARQL queries.

The read_graph/1 and write_graph/2 functions allow for reading and writing RDF graphs to the project data repository. (Default file names are provided with the read_graph/0 and write_graph/1 forms.) The list_graphs/0 function lists graph file names.

The read_query/1 and write_query/2 functions allow for reading and writing SPARQL queries to the project data repository. (Default file names are provided with the read_query/0 and write_query/1 forms.) The list_queries/0 function lists query file names.

Some simple accessor functions are also available:

graphs_dir/0, graph_file/0, temp_graph_file/0
queries_dir/0, query_file/0, temp_query_file/0

Link to this section Summary

Functions

book()

Creates a Book graph

books()

Reads a Books graph from the graphs library

graph_file()

Returns a default RDF graph file

graphs_dir()

Returns the LPG graphs directory

list_graphs()

Lists RDF graphs in the RDF graphs library

list_queries()

Lists SPARQL queries in the RDF queries library

queries_dir()

Returns the LPG queries directory

query_file()

Returns a default SPARQL query file

read_graph(graph_file \\ graph_file())

Reads a RDF graph from the RDF graphs library

read_query(query_file \\ query_file())

Reads a SPARQL query from the RDF queries library

temp_graph_file()

Returns a temp RDF graph file for writing

temp_query_file()

Returns a temp SPARQL query file for writing

write_graph(graph_data, graph_file \\ temp_graph_file())

Writes a RDF graph to a file in the RDF graphs library

write_query(query_data, query_file \\ temp_query_file())

Writes a SPARQL query to a file in the RDF queries library

Link to this section Functions

book()

Creates a Book graph.

Examples

iex> TestGraph.RDF.book()
#RDF.Description{subject: ~I<urn:isbn:978-1-68050-252-7>
     ~I<http://purl.org/dc/elements/1.1/creator>
         ~I<https://twitter.com/bgmarx>
         ~I<https://twitter.com/josevalim>
         ~I<https://twitter.com/redrapids>
     ~I<http://purl.org/dc/elements/1.1/date>
         %RDF.Literal{value: ~D[2018-03-14], datatype: ~I<http://www.w3.org/2001/XMLSchema#date>}
     ~I<http://purl.org/dc/elements/1.1/format>
         ~L"Paper"
     ~I<http://purl.org/dc/elements/1.1/publisher>
         ~I<https://pragprog.com/>
     ~I<http://purl.org/dc/elements/1.1/title>
         ~L"Adopting Elixir"en
     ~I<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
         ~I<http://purl.org/ontology/bibo/Book>}

books()

Reads a Books graph from the graphs library.

Examples

iex> books().data
""<urn:isbn:978-1-68050-252-7>\n    a <http://purl.org/ontology/bibo/Book> ;\n ..."

graph_file()

Returns a default RDF graph file.

Examples

iex> TestGraph.RDF.graph_file()
"default.ttl"

graphs_dir()

Returns the LPG graphs directory.

list_graphs()

Lists RDF graphs in the RDF graphs library.

Examples

iex> list_graphs()
["books.ttl", "urn_isbn_978-1-68050-252-7.ttl",
 "http___dbpedia.org_resource_London.ttl", "london100.ttl", "london.ttl",
 "nobelprizes.ttl", "bibo.ttl", "temp.ttl",
 "http___example.org_Elixir.ttl", "elixir.ttl", "default.ttl", "cypher.ttl",
 "neo4j.ttl", "hello.ttl"]

list_queries()

Lists SPARQL queries in the RDF queries library.

Examples

iex> list_queries()
["cypher.rq", "london.rq", "elixir.rq", "default.rq", "neo4j.rq",
 "triples_by_uri.rq", "triples.rq", "hello.rq"]

queries_dir()

Returns the LPG queries directory.

query_file()

Returns a default SPARQL query file.

Examples

iex> TestGraph.RDF.query_file()
"default.rq"

read_graph(graph_file \\ graph_file())

Reads a RDF graph from the RDF graphs library.

Examples

iex> read_graph()
%TestGraph.Graph{
  data: "<http://dbpedia.org/resource/Hello_World>\n..."
  file: "default.ttl",
  path: ".../test_graph/priv/rdf/graphs/default.ttl",
  type: :rdf,
  uri: "file:///.../test_graph/priv/rdf/graphs/default.ttl"
}

iex> read_graph("books.ttl")
%TestGraph.Graph{
  data: "@prefix bibo: <http://purl.org/ontology/bibo/> \n..."
  file: "books.ttl",
  path: ".../test_graph/priv/rdf/graphs/books.ttl",
  type: :rdf,
  uri: "file:///.../test_graph/priv/rdf/graphs/books.ttl"
}

read_query(query_file \\ query_file())

Reads a SPARQL query from the RDF queries library.

Examples

iex> read_query()
%TestGraph.Query{
  data: "construct { ?s ?p ?o } where { ..."
  file: "books.rq",
  path: ".../test_graph/priv/rdf/queries/books.rq",
  type: :rdf,
  uri: "file:///.../test_graph/priv/rdf/queries/books.rq"
}

iex> read_query("books.rq")
%TestGraph.Query{
  data: "construct { ?s ?p ?o } where { ..."
  file: "books.rq",
  path: ".../test_graph/priv/rdf/queries/books.rq",
  type: :rdf,
  uri: "file:///.../test_graph/priv/rdf/queries/books.rq"
}

temp_graph_file()

Returns a temp RDF graph file for writing.

Examples

iex> TestGraph.RDF.temp_graph_file()
"temp.ttl"

temp_query_file()

Returns a temp SPARQL query file for writing.

Examples

iex> TestGraph.RDF.temp_query_file()
"temp.rq"

write_graph(graph_data, graph_file \\ temp_graph_file())

Writes a RDF graph to a file in the RDF graphs library.

Examples

iex> data |> write_graph("my.ttl")
%TestGraph.Graph{
  data: "@prefix bibo: <http://purl.org/ontology/bibo/> \n..."
  file: "my.ttl",
  path: "/test_graph/priv/rdf/graphs/my.ttl",
  type: :rdf,
  uri: "file:///.../test_graph/priv/rdf/graphs/my.ttl"
}

write_query(query_data, query_file \\ temp_query_file())

Writes a SPARQL query to a file in the RDF queries library.

Examples

iex> write_query("my.rq")
%TestGraph.Query{
  data: "construct { ?s ?p ?o } where { ..."
  file: "my.rq",
  path: ".../test_graph/priv/rdf/queries/my.rq",
  type: :rdf,
  uri: "file:///.../test_graph/priv/rdf/queries/my.rq"
}