メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.4250000 34.8750000, 137.4312500 34.8750000, 137.4312500 34.8791667, 137.4250000 34.8791667, 137.4250000 34.8750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral