メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.8187500 33.8833333, 135.8250000 33.8833333, 135.8250000 33.8875000, 135.8187500 33.8875000, 135.8187500 33.8833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral