メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7875000 38.3208334, 140.7937500 38.3208334, 140.7937500 38.3250000, 140.7875000 38.3250000, 140.7875000 38.3208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral