メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.1500000 34.3208334, 135.1562500 34.3208334, 135.1562500 34.3250000, 135.1500000 34.3250000, 135.1500000 34.3208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral