メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.89105368838 43.0155807996482, 142.890674481296 43.0153360623506, 142.889947256613 43.0148771426736, 142.890913489873 43.0140539557356, 142.891926612024 43.0146883596196, 142.892036757599 43.0147549075177, 142.891083021458 43.0155537705168, 142.89105368838 43.0155807996482)) ^^http://www.opengis.net/ont/geosparql#wktLiteral