メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.380039481402 43.7620381335643, 142.380045435106 43.7620494836438, 142.380359944445 43.7625934193612, 142.378882599046 43.7630132822754, 142.378569231839 43.7624813851361, 142.378267100594 43.7619661575228, 142.378258441777 43.7619499407317, 142.379768700528 43.7615227518213, 142.380039481402 43.7620381335643)) ^^http://www.opengis.net/ont/geosparql#wktLiteral