メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.381577500631 43.7616149685026, 142.381859920028 43.7621443443275, 142.380359944445 43.7625934193612, 142.380045435106 43.7620494836438, 142.380039481402 43.7620381335643, 142.379768700528 43.7615227518213, 142.381266901953 43.7610865548819, 142.381577500631 43.7616149685026)) ^^http://www.opengis.net/ont/geosparql#wktLiteral