メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8437500 33.3208334, 129.8500000 33.3208334, 129.8500000 33.3250000, 129.8437500 33.3250000, 129.8437500 33.3208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral