メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.641824581715 43.9403721444002, 141.642350436135 43.9407873517273, 141.642859470507 43.9411921255023, 141.642712440582 43.9412908201319, 141.642374474692 43.9415177046693, 141.641334821767 43.9406926533756, 141.640323560614 43.9398632978937, 141.640801752317 43.9395605617061, 141.641516280813 43.9401243055514, 141.641824581715 43.9403721444002)) ^^http://www.opengis.net/ont/geosparql#wktLiteral