メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.406304233737 44.1652371049696, 142.404219748403 44.1649391433717, 142.40327237784 44.1647968262781, 142.402897467769 44.1648501693586, 142.402825978441 44.1648603561376, 142.40322505612 44.1635590385531, 142.406426685822 44.1640092125977, 142.406304233737 44.1652371049696)) ^^http://www.opengis.net/ont/geosparql#wktLiteral