core: remove add and put from RDF.Data protocol

We will introduce RDF.Data.merge instead, which can be implemented more consistently
over all structures.

lib/rdf/data.ex

@@ -3,16 +3,6 @@ defprotocol RDF.Data do
   An abstraction over the different data structures for collections of RDF statements.
   """
 
-  @doc """
-  Add statements to a RDF data structure.
-  """
-  def add(data, statements)
-
-  @doc """
-  Adds statements to a RDF data structure and overwrites all existing statements with the same subjects and predicates.
-  """
-  def put(data, statements)
-
   @doc """
   Deletes statements from a RDF data structure.
   """

lib/rdf/description.ex

@@ -503,8 +503,6 @@ defimpl Enumerable, for: RDF.Description do
 end
 
 defimpl RDF.Data, for: RDF.Description do
-  def add(description, statements),    do: RDF.Description.add(description, statements)
-  def put(description, statements),    do: RDF.Description.put(description, statements)
   def delete(%RDF.Description{subject: subject} = description,
              %RDF.Description{subject: other_subject})
     when subject != other_subject,

test/unit/description_test.exs

@@ -366,20 +366,6 @@ defmodule RDF.DescriptionTest do
       }
     end
 
-    test "add", %{description: description} do
-      assert RDF.Data.add(description, {EX.S, EX.p1, EX.O4}) ==
-              Description.add(description, {EX.S, EX.p1, EX.O4})
-
-      assert RDF.Data.add(description, {EX.Other, EX.p2, EX.O4}) == description
-    end
-
-    test "put", %{description: description} do
-      assert RDF.Data.put(description, {EX.S, EX.p1, EX.O4}) ==
-              Description.put(description, {EX.S, EX.p1, EX.O4})
-
-      assert RDF.Data.put(description, {EX.Other, EX.p2, EX.O4}) == description
-    end
-
     test "delete", %{description: description} do
       assert RDF.Data.delete(description, {EX.S, EX.p1, EX.O2}) ==
               Description.delete(description, {EX.S, EX.p1, EX.O2})