メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.371834622243 45.1256670909611, 142.371760455668 45.1259618891144, 142.37196380293 45.125987189716, 142.371781261199 45.1267068859297, 142.370512009662 45.1265517557839, 142.3706964434 45.1258199669297, 142.370752763917 45.1255305305433, 142.371834622243 45.1256670909611)) ^^http://www.opengis.net/ont/geosparql#wktLiteral