メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.3187500 34.9458334, 135.3250000 34.9458334, 135.3250000 34.9500000, 135.3187500 34.9500000, 135.3187500 34.9458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral