メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.4187500 34.4833333, 135.4250000 34.4833333, 135.4250000 34.4875000, 135.4187500 34.4875000, 135.4187500 34.4833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral