メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.1937500 37.3208334, 137.2000000 37.3208334, 137.2000000 37.3250000, 137.1937500 37.3250000, 137.1937500 37.3208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral