メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6437500 33.7208334, 129.6500000 33.7208334, 129.6500000 33.7250000, 129.6437500 33.7250000, 129.6437500 33.7208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral