メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.4062500 34.7208334, 135.4125000 34.7208334, 135.4125000 34.7250000, 135.4062500 34.7250000, 135.4062500 34.7208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral