メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.8875000 34.4125000, 135.8937500 34.4125000, 135.8937500 34.4166667, 135.8875000 34.4166667, 135.8875000 34.4125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral