メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((125.4000000 24.7291667, 125.4062500 24.7291667, 125.4062500 24.7333333, 125.4000000 24.7333333, 125.4000000 24.7291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral