<option value="csv">Comma Separated Values (CSV)</option>
<option value="geojson">(Geo)JSON</option>
<option value="gdf">Graph Definition Format (GDF)</option>
<option value="graphml">Graph Markup Language (GraphML)</option>
<option value="json">JSON-LD</option>
<option value="tgf">Trivial Graph Format (TGF)</option>
<option value="tsv">Tab Separated Values (TSV)</option>
<option value="ttl" selected>Turtle (TTL)</option>
