メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.8312500 32.8208334, 130.8375000 32.8208334, 130.8375000 32.8250000, 130.8312500 32.8250000, 130.8312500 32.8208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral