メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.122401722087 42.9850773392962, 144.119616210062 42.9845061700979, 144.121444034213 42.9833354851781, 144.121836799001 42.9830838234056, 144.123487057502 42.9838789618533, 144.123328374863 42.9840538656673, 144.123068666852 42.9843403468948, 144.122401722087 42.9850773392962)) ^^http://www.opengis.net/ont/geosparql#wktLiteral