メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.390763934061 44.1653605064082, 142.390111156711 44.1652635103838, 142.388048895278 44.164934177921, 142.388460675218 44.1636028438603, 142.390511084094 44.1639518367872, 142.391203526253 44.1640666785077, 142.390763934061 44.1653605064082)) ^^http://www.opengis.net/ont/geosparql#wktLiteral