メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.905811560805 43.4839718373597, 141.904953169071 43.4841135708104, 141.90490320861 43.4838746337132, 141.904538687591 43.4827521755097, 141.905393617292 43.4826343098132, 141.905740326112 43.4837494682681, 141.905782194336 43.4838717826108, 141.905811560805 43.4839718373597)) ^^http://www.opengis.net/ont/geosparql#wktLiteral