メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.380501172056 43.7802420896993, 142.380396088106 43.7802702828092, 142.37972361931 43.7804540684131, 142.37913031186 43.7793522879485, 142.379865082062 43.7791260311387, 142.380490090713 43.7802340847482, 142.380501172056 43.7802420896993)) ^^http://www.opengis.net/ont/geosparql#wktLiteral