メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.375281198746 34.9782104749477, 138.374345507587 34.9785895428937, 138.373798693311 34.9777587251611, 138.373719683784 34.9776250439645, 138.373829808642 34.9775793791381, 138.373991113054 34.9775124282397, 138.374547428816 34.9772819982546, 138.374828635669 34.9777459033732, 138.374949842806 34.977692784727, 138.375281198746 34.9782104749477)) ^^http://www.opengis.net/ont/geosparql#wktLiteral