メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.908180435396 43.4822523965756, 141.908085429106 43.4822265856908, 141.907321070022 43.4823282504883, 141.906975060688 43.4810743136415, 141.907013681225 43.4810675372566, 141.90701887448 43.4810883337606, 141.907801172858 43.4809584893141, 141.908180435396 43.4822523965756)) ^^http://www.opengis.net/ont/geosparql#wktLiteral