メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.4250000 34.7208334, 136.4312500 34.7208334, 136.4312500 34.7250000, 136.4250000 34.7250000, 136.4250000 34.7208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral