メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.405582944766 43.7440519941825, 142.406271704807 43.7440164847111, 142.406352173084 43.7447500581498, 142.406385534023 43.7449997948239, 142.405688804974 43.7450333987685, 142.404058636265 43.7451157138325, 142.402350931728 43.7452145466816, 142.402286095385 43.7447190764318, 142.402247790754 43.7442427508167, 142.403940529058 43.7441425516671, 142.405582944766 43.7440519941825)) ^^http://www.opengis.net/ont/geosparql#wktLiteral