メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.861772788941 43.3443193876583, 141.859991415089 43.3445676309181, 141.85941456161 43.3425521523607, 141.859460110908 43.342544993769, 141.861174512629 43.3422828136934, 141.861772788941 43.3443193876583)) ^^http://www.opengis.net/ont/geosparql#wktLiteral