メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.434397269561 43.8107532511757, 142.434387294826 43.8107617056946, 142.433794145765 43.8112586460358, 142.433228662261 43.8117363226524, 142.431151540692 43.8104523939417, 142.431699907156 43.8099836706709, 142.432330272527 43.8094753304333, 142.433619611551 43.8102797378527, 142.434397269561 43.8107532511757)) ^^http://www.opengis.net/ont/geosparql#wktLiteral