メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.391331002285 44.1705747797015, 142.388574971137 44.1701340835932, 142.388864815418 44.1691662799622, 142.391639978821 44.1696437400957, 142.391331002285 44.1705747797015)) ^^http://www.opengis.net/ont/geosparql#wktLiteral