メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.332073261415 43.7514480741829, 142.332345950429 43.7515242484671, 142.33275822247 43.7516476828939, 142.33218381918 43.7527499902746, 142.331439359098 43.7525178451674, 142.33080418439 43.7523222382732, 142.331445907565 43.7512630652017, 142.331613186075 43.7513065805816, 142.332073261415 43.7514480741829)) ^^http://www.opengis.net/ont/geosparql#wktLiteral