メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.375209458521 43.0949868109591, 141.375203677333 43.0950086383171, 141.375107565901 43.0954157951823, 141.37361779294 43.0952720592983, 141.373714280664 43.0948392375678, 141.373842523076 43.094286049827, 141.373873552962 43.0942904359245, 141.374596536518 43.0943663574027, 141.375352102612 43.0944456862313, 141.375209458521 43.0949868109591)) ^^http://www.opengis.net/ont/geosparql#wktLiteral