メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.901524331393 43.4807396318604, 141.90083978878 43.4808431829692, 141.900695314418 43.4802975510526, 141.901371801584 43.480237366729, 141.901521654097 43.4807308337079, 141.901524331393 43.4807396318604)) ^^http://www.opengis.net/ont/geosparql#wktLiteral