メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.904557154534 43.1090455972825, 142.901259527435 43.1085894579471, 142.901671147492 43.1073067609527, 142.901748759432 43.1070633294556, 142.901767433188 43.1070048500578, 142.902890506873 43.1071881330117, 142.905020567428 43.1075357780113, 142.904557154534 43.1090455972825)) ^^http://www.opengis.net/ont/geosparql#wktLiteral