メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.8910166861 43.0199206132982, 142.890037028112 43.0193274408875, 142.891034850096 43.0185080188844, 142.891275859854 43.0186602014006, 142.891981161589 43.0190932838386, 142.8910166861 43.0199206132982)) ^^http://www.opengis.net/ont/geosparql#wktLiteral