メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.384444145447 42.9870277110405, 144.382823022735 42.9867468467081, 144.383020174449 42.9861383451715, 144.3838607232 42.9862792031853, 144.384579113858 42.986615598048, 144.384444145447 42.9870277110405)) ^^http://www.opengis.net/ont/geosparql#wktLiteral