メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.91048301137 43.4965571828288, 141.909654565522 43.4966919591, 141.909327081547 43.4956317966309, 141.910153808969 43.4955082695778, 141.91016373677 43.4955464513968, 141.910348708697 43.4961457960694, 141.91048301137 43.4965571828288)) ^^http://www.opengis.net/ont/geosparql#wktLiteral