メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.388807836167 44.162527875838, 142.384961693992 44.1619717629792, 142.38461361178 44.1610344756802, 142.384486630802 44.1607017952239, 142.388875299389 44.1612407965488, 142.389184157502 44.1613080156604, 142.388807836167 44.162527875838)) ^^http://www.opengis.net/ont/geosparql#wktLiteral