Add RDF.BlankNode.value/1

CHANGELOG.md

@@ -11,6 +11,7 @@ This project adheres to [Semantic Versioning](http://semver.org/) and
 
 - `RDF.Dataset.prefixes/1` for getting an aggregated `RDF.PrefixMap` over all graphs
 - `RDF.PrefixMap.put/3` for adding a prefix mapping and overwrite an existing one
+- `RDF.BlankNode.value/1` for getting the internal string representation of a blank node
  
 ### Changed
 

lib/rdf/blank_node.ex

@@ -40,6 +40,11 @@ defmodule RDF.BlankNode do
   def new(value) when is_atom(value) or is_integer(value),
     do: value |> to_string |> new
 
+  @doc """
+  Returns the internal string representation of a blank node.
+  """
+  def value(%__MODULE__{} = bnode), do: bnode.value
+
   @doc """
   Tests for value equality of blank nodes.