メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.25730666596 44.0231780824523, 144.257033130858 44.0235851173155, 144.255898761668 44.0225959905676, 144.256125094669 44.0217084893457, 144.256688929946 44.0217259657437, 144.256763941224 44.0221698256156, 144.256893602591 44.0226332829153, 144.257394766468 44.0230339727137, 144.25730666596 44.0231780824523)) ^^http://www.opengis.net/ont/geosparql#wktLiteral