メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.1562500 26.7166667, 128.1625000 26.7166667, 128.1625000 26.7208334, 128.1562500 26.7208334, 128.1562500 26.7166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral