メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.760887675659 43.1900035408793, 141.760900741608 43.1900102780154, 141.76131068187 43.1902204816687, 141.761334166265 43.1902344369346, 141.759947421415 43.1916594652984, 141.759522317042 43.1914519348052, 141.759026220226 43.1912097770424, 141.759705512695 43.1905019570631, 141.760414121768 43.1897678155204, 141.760887675659 43.1900035408793)) ^^http://www.opengis.net/ont/geosparql#wktLiteral