メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.890037028112 43.0193274408875, 142.889285424178 43.0188557124523, 142.890239662575 43.0180060869863, 142.890277291222 43.0180298587756, 142.890965048119 43.0184639606415, 142.891034850096 43.0185080188844, 142.890037028112 43.0193274408875)) ^^http://www.opengis.net/ont/geosparql#wktLiteral