メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.910344024864 43.4989635166215, 141.910292154741 43.4989708517905, 141.909965784244 43.4979661463448, 141.910891144865 43.4978175907091, 141.91098713489 43.4981331498092, 141.9111738429 43.4988430168539, 141.910344024864 43.4989635166215)) ^^http://www.opengis.net/ont/geosparql#wktLiteral