メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.3625000 44.3500000, 143.3687500 44.3500000, 143.3687500 44.3541667, 143.3625000 44.3541667, 143.3625000 44.3500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral