View Source RDF.Star.Quad (RDF.ex v2.0.1)
Helper functions for RDF-star quads.
An RDF-star quad is represented as a plain Elixir tuple consisting of four valid
RDF values for subject, predicate, object and a graph name.
As opposed to an RDF.Quad
the subject or object can be a triple.
Summary
Functions
Creates a RDF.Star.Quad
with proper RDF-star values.
Creates a RDF.Star.Quad
with proper RDF-star values.
Checks if the given tuple is a valid RDF quad.
Types
@type coercible() :: {RDF.Star.Statement.coercible_subject(), RDF.Star.Statement.coercible_predicate(), RDF.Star.Statement.coercible_object(), RDF.Star.Statement.coercible_graph_name()}
@type t() :: {RDF.Star.Statement.subject(), RDF.Star.Statement.predicate(), RDF.Star.Statement.object(), RDF.Star.Statement.graph_name()}
Functions
@spec new(RDF.Star.Statement.coercible(), RDF.PropertyMap.t() | nil) :: t()
Creates a RDF.Star.Quad
with proper RDF-star values.
An error is raised when the given elements are not coercible to RDF-star values.
Note: The RDF.quad
function is a shortcut to this function.
Examples
iex> RDF.Star.Quad.new {"http://example.com/S", "http://example.com/p", 42, "http://example.com/Graph"}
{~I<http://example.com/S>, ~I<http://example.com/p>, RDF.literal(42), ~I<http://example.com/Graph>}
iex> RDF.Star.Quad.new {EX.S, EX.p, 42, EX.Graph}
{RDF.iri("http://example.com/S"), RDF.iri("http://example.com/p"), RDF.literal(42), RDF.iri("http://example.com/Graph")}
iex> RDF.Star.Quad.new {EX.S, EX.p, 42}
{RDF.iri("http://example.com/S"), RDF.iri("http://example.com/p"), RDF.literal(42), nil}
iex> RDF.Star.Quad.new {EX.S, :p, 42, EX.Graph}, RDF.PropertyMap.new(p: EX.p)
{RDF.iri("http://example.com/S"), RDF.iri("http://example.com/p"), RDF.literal(42), RDF.iri("http://example.com/Graph")}
iex> RDF.Star.Quad.new({{EX.S, :p, 42}, :p2, 43, EX.Graph}, RDF.PropertyMap.new(p: EX.p, p2: EX.p2))
{{~I<http://example.com/S>, ~I<http://example.com/p>, RDF.literal(42)}, ~I<http://example.com/p2>, RDF.literal(43), ~I<http://example.com/Graph>}
@spec new( RDF.Star.Statement.coercible_subject(), RDF.Star.Statement.coercible_predicate(), RDF.Star.Statement.coercible_object(), RDF.Star.Statement.coercible_graph_name(), RDF.PropertyMap.t() | nil ) :: t()
Creates a RDF.Star.Quad
with proper RDF-star values.
An error is raised when the given elements are not coercible to RDF-star values.
Note: The RDF.quad
function is a shortcut to this function.
Examples
iex> RDF.Star.Quad.new("http://example.com/S", "http://example.com/p", 42, "http://example.com/Graph")
{~I<http://example.com/S>, ~I<http://example.com/p>, RDF.literal(42), ~I<http://example.com/Graph>}
iex> RDF.Star.Quad.new(EX.S, EX.p, 42, EX.Graph)
{RDF.iri("http://example.com/S"), RDF.iri("http://example.com/p"), RDF.literal(42), RDF.iri("http://example.com/Graph")}
iex> RDF.Star.Quad.new(EX.S, :p, 42, EX.Graph, RDF.PropertyMap.new(p: EX.p))
{RDF.iri("http://example.com/S"), RDF.iri("http://example.com/p"), RDF.literal(42), RDF.iri("http://example.com/Graph")}
iex> RDF.Star.Quad.new(EX.S, :p, 42, EX.Graph, RDF.PropertyMap.new(p: EX.p))
{RDF.iri("http://example.com/S"), RDF.iri("http://example.com/p"), RDF.literal(42), RDF.iri("http://example.com/Graph")}
iex> RDF.Star.Quad.new({EX.S, :p, 42}, :p2, 43, EX.Graph, RDF.PropertyMap.new(p: EX.p, p2: EX.p2))
{{~I<http://example.com/S>, ~I<http://example.com/p>, RDF.literal(42)}, ~I<http://example.com/p2>, RDF.literal(43), ~I<http://example.com/Graph>}
Checks if the given tuple is a valid RDF quad.
The elements of a valid RDF-star quad must be RDF terms. On the subject position only IRIs, blank nodes and triples are allowed, while on the predicate and graph name position only IRIs allowed. The object position can be any RDF term or triple.