メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.94653126356 42.9418042731086, 142.945467535313 42.9424595370685, 142.945406869148 42.9424959146779, 142.944433009549 42.9416036215168, 142.944490448885 42.9415697261225, 142.945546873437 42.9409464455462, 142.945767407816 42.9411395023763, 142.94653126356 42.9418042731086)) ^^http://www.opengis.net/ont/geosparql#wktLiteral