メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.755004574345 43.1983090397453, 141.754678133608 43.1986520976578, 141.753779599832 43.1981782049013, 141.754486949406 43.1974313564289, 141.755383049486 43.1978963013227, 141.755004574345 43.1983090397453)) ^^http://www.opengis.net/ont/geosparql#wktLiteral