メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.288091069664 42.2889537372059, 143.281803856401 42.2907336971504, 143.280559380749 42.2880492349697, 143.283278778087 42.2872530495658, 143.287524150281 42.2880036724338, 143.288091069664 42.2889537372059)) ^^http://www.opengis.net/ont/geosparql#wktLiteral