メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.39303439748 44.1792552104961, 142.391372656149 44.1789870592554, 142.391575263495 44.1783317070294, 142.392461189739 44.178476800213, 142.393216580612 44.178600496634, 142.39303439748 44.1792552104961)) ^^http://www.opengis.net/ont/geosparql#wktLiteral