メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.392062806415 44.1669407964171, 142.390367018862 44.1666763945332, 142.390763934061 44.1653605064082, 142.392285031352 44.165586496933, 142.392459918913 44.1656136151977, 142.392062806415 44.1669407964171)) ^^http://www.opengis.net/ont/geosparql#wktLiteral