メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.7625000 33.8375000, 129.7687500 33.8375000, 129.7687500 33.8416667, 129.7625000 33.8416667, 129.7625000 33.8375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral