Added a config property to add an additional line between each triple…

…. This improves readability of documents with many definitions.

lib/iq_rdf/document.rb

@@ -25,6 +25,7 @@ def initialize(default_namespace_uri_prefix = nil, *args)
       @document_language = options[:lang]
 
       @nodes = []
+      @config = {}
     end
 
     def namespaces(namespaces)
@@ -39,6 +40,10 @@ def namespaces(namespaces)
       self
     end
 
+    def config(config = {})
+      @config = config
+    end
+
     def <<(node)
       return if node.nil?
       raise ArgumentError, "Node must be an IqRdf::Uri and a Subject!" unless node.is_a?(IqRdf::Uri) and node.is_subject?
@@ -163,6 +168,9 @@ def to_turtle
           pref = ";\n" + indent
         end
         s << ".\n"
+        if @config[:empty_line_between_triples]
+          s << "\n"
+        end
       end
       s
     end

test/turtle_test.rb

@@ -241,6 +241,24 @@ def test_blank_nodes_with_different_ns
            qb:order 1;
            eg:cost 2.25
        ].
+rdf
+  end
+
+  def test_config
+    document = IqRdf::Document.new('http://www.test.de/')
+    document.config(empty_line_between_triples: true)
+
+    document << IqRdf::testemann.myCustomNote("This is an example", :lang => :en)
+    document << IqRdf::testemann.myCustomNote("Zweites Beispiel", :lang => :de)
+
+    assert_equal(<<rdf, document.to_turtle)
+@prefix : <http://www.test.de/>.
+@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
+
+:testemann :myCustomNote "This is an example"@en.
+
+:testemann :myCustomNote "Zweites Beispiel"@de.
+
 rdf
   end