メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8375000 32.8000000, 129.8437500 32.8000000, 129.8437500 32.8041667, 129.8375000 32.8041667, 129.8375000 32.8000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral