メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.6187500 35.1000000, 136.6250000 35.1000000, 136.6250000 35.1041667, 136.6187500 35.1041667, 136.6187500 35.1000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral