メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.915922064566 43.5004690334541, 141.915248708538 43.5005689297246, 141.915021576412 43.4997316231823, 141.914983953311 43.4996307349891, 141.916630291396 43.4993918376542, 141.916645104707 43.4994426915675, 141.916901280235 43.5003210094469, 141.916540404702 43.5003773423576, 141.915922064566 43.5004690334541)) ^^http://www.opengis.net/ont/geosparql#wktLiteral