メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.388190394862 42.9857809369294, 144.386637813868 42.9855258603516, 144.386815957457 42.9849558382401, 144.388374445978 42.9852103815982, 144.388190394862 42.9857809369294)) ^^http://www.opengis.net/ont/geosparql#wktLiteral