メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.760368269558 43.2029760808567, 141.760124677956 43.2032202735581, 141.759890263651 43.2034886979528, 141.758941356642 43.2030184953815, 141.759204649424 43.2027516037247, 141.759436448719 43.2025216387268, 141.760368269558 43.2029760808567)) ^^http://www.opengis.net/ont/geosparql#wktLiteral