メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.908541588718 37.7804213591441, 140.908339570128 37.7801343099631, 140.908370486557 37.7800461788612, 140.908427089858 37.7799987830131, 140.908640337126 37.7801304426314, 140.908702816789 37.7802130768504, 140.908720598383 37.7802895014045, 140.90864489346 37.7803712832025, 140.908541588718 37.7804213591441)) ^^http://www.opengis.net/ont/geosparql#wktLiteral