メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.38774097613 43.6884207059034, 142.386098416757 43.6879208191773, 142.387437310508 43.6855996573292, 142.388270724518 43.6858563645535, 142.389113464163 43.6861159016391, 142.388523797669 43.687072220961, 142.38774097613 43.6884207059034)) ^^http://www.opengis.net/ont/geosparql#wktLiteral