メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.751911508626 43.1972282623893, 141.751268551213 43.1978963950213, 141.75043110738 43.1974568535912, 141.751056808598 43.196801166897, 141.751120246494 43.196837311671, 141.751911508626 43.1972282623893)) ^^http://www.opengis.net/ont/geosparql#wktLiteral