メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((124.1625000 24.4458334, 124.1687500 24.4458334, 124.1687500 24.4500000, 124.1625000 24.4500000, 124.1625000 24.4458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral