メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.8937500 27.8000000, 128.9000000 27.8000000, 128.9000000 27.8041667, 128.8937500 27.8041667, 128.8937500 27.8000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral