Add coercible_t type on Triple and Quad modules

CHANGELOG.md

@@ -11,6 +11,8 @@ This project adheres to [Semantic Versioning](http://semver.org/) and
 
 - `:implicit_base` option on the `RDF.Turtle.Encoder`
 - `:base_description` option on the `RDF.Turtle.Encoder`
+- `RDF.Triple.coercible_t`, `RDF.Quad.coercible_t`, `RDF.Star.Triple.coercible_t`  
+  and `RDF.Star.Quad.coercible_t` types
 
 
 [Compare v0.10.0...HEAD](https://github.com/rdf-elixir/rdf-ex/compare/v0.10.0...HEAD)

lib/rdf/quad.ex

@@ -15,6 +15,14 @@ defmodule RDF.Quad do
           Statement.graph_name()
         }
 
+  @type coercible_t ::
+          {
+            Statement.coercible_subject(),
+            Statement.coercible_predicate(),
+            Statement.coercible_object(),
+            Statement.coercible_graph_name()
+          }
+
   @type t_values :: {String.t(), String.t(), any, String.t()}
 
   @doc """

lib/rdf/star/quad.ex

@@ -17,6 +17,14 @@ defmodule RDF.Star.Quad do
           Statement.graph_name()
         }
 
+  @type coercible_t ::
+          {
+            Statement.coercible_subject(),
+            Statement.coercible_predicate(),
+            Statement.coercible_object(),
+            Statement.coercible_graph_name()
+          }
+
   @type t_values :: {String.t(), String.t(), any, String.t()}
 
   @doc """

lib/rdf/star/statement.ex

@@ -19,9 +19,7 @@ defmodule RDF.Star.Statement do
   @type coercible_graph_name :: RDF.Statement.coercible_graph_name()
 
   @type t :: Triple.t() | Quad.t()
-  @type coercible_t ::
+  @type coercible_t :: Triple.coercible_t() | Quad.coercible_t()
-          {coercible_subject(), coercible_predicate(), coercible_object(), coercible_graph_name()}
-          | {coercible_subject(), coercible_predicate(), coercible_object()}
 
   @type term_mapping :: RDF.Statement.term_mapping()
 

lib/rdf/star/triple.ex

@@ -12,6 +12,13 @@ defmodule RDF.Star.Triple do
 
   @type t :: {Statement.subject(), Statement.predicate(), Statement.object()}
 
+  @type coercible_t ::
+          {
+            Statement.coercible_subject(),
+            Statement.coercible_predicate(),
+            Statement.coercible_object()
+          }
+
   @doc """
   Creates a `RDF.Star.Triple` with proper RDF-star values.
 

lib/rdf/statement.ex

@@ -23,9 +23,7 @@ defmodule RDF.Statement do
   @type term_mapping :: (qualified_term -> any | nil)
 
   @type t :: Triple.t() | Quad.t()
-  @type coercible_t ::
+  @type coercible_t :: Triple.coercible_t() | Quad.coercible_t()
-          {coercible_subject(), coercible_predicate(), coercible_object(), coercible_graph_name()}
-          | {coercible_subject(), coercible_predicate(), coercible_object()}
 
   @doc """
   Creates a `RDF.Triple` or `RDF.Quad` with proper RDF values.

lib/rdf/triple.ex

@@ -10,6 +10,13 @@ defmodule RDF.Triple do
 
   @type t :: {Statement.subject(), Statement.predicate(), Statement.object()}
 
+  @type coercible_t ::
+          {
+            Statement.coercible_subject(),
+            Statement.coercible_predicate(),
+            Statement.coercible_object()
+          }
+
   @type t_values :: {String.t(), String.t(), any}
 
   @doc """