メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.0687500 34.6125000, 136.0750000 34.6125000, 136.0750000 34.6166667, 136.0687500 34.6166667, 136.0687500 34.6125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral