メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.9125000 43.8291667, 143.9187500 43.8291667, 143.9187500 43.8333333, 143.9125000 43.8333333, 143.9125000 43.8291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral