メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.402244587595 44.1755636824131, 142.401381179887 44.1754244033646, 142.401698737152 44.1743868857391, 142.402322331221 44.1744852412222, 142.40256803727 44.1745240092189, 142.402370383487 44.175159335042, 142.402244587595 44.1755636824131)) ^^http://www.opengis.net/ont/geosparql#wktLiteral