Text Representation of RDF with turtle
<p>I want to make a textual representations of an RDF graph with Turtle. As an example the relation between Spiderman and the Green Goblin. See the reference here <a href="https://www.w3.org/TR/turtle/" rel="nofollow">https://www.w3.org/TR/turtle/</a></p>

<pre><code>@base &lt;http://example.org/&gt; .
@prefix rdf: &lt;http://www.w3.org/1999/02/22-rdf-syntax-ns#&gt; .
@prefix rdfs: &lt;http://www.w3.org/2000/01/rdf-schema#&gt; .
@prefix foaf: &lt;http://xmlns.com/foaf/0.1/&gt; .
@prefix rel: &lt;http://www.perceive.net/schemas/relationship/&gt; 

&lt;#green-goblin&gt;
    rel:enemyOf &lt;#spiderman&gt; ;
    a foaf:Person ;    # in the context of the Marvel universe
    foaf:name "Green Goblin" .
&lt;#spiderman&gt;
    rel:enemyOf &lt;#green-goblin&gt; ;
    a foaf:Person ;
    foaf:name "Spiderman", "Человек-паук"@ru .
</code></pre>

<p>What does the comma (<code>,</code>) mean between "Spiderman" and the Russian word?</p>

<p>Another more important question is: how can I do that with a city and a country over time? For example: Leipzig belonged to the DDR until 1990. Today Leipzig is a city in Germany.</p>