メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.602302740701 42.8880042713783, 141.602649942159 42.8885164156661, 141.602998402071 42.8890595125622, 141.60355425606 42.889925825996, 141.601743400262 42.8905792959288, 141.599804860157 42.8912787821436, 141.599223281664 42.8904431803176, 141.598481722085 42.8893775983735, 141.597786533463 42.8883570762094, 141.598315864439 42.8881666819673, 141.599755366877 42.8876490042436, 141.60103821761 42.8871875994151, 141.601609771417 42.8869820259829, 141.602302740701 42.8880042713783)) ^^http://www.opengis.net/ont/geosparql#wktLiteral