メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.8250000 32.7000000, 128.8312500 32.7000000, 128.8312500 32.7041667, 128.8250000 32.7041667, 128.8250000 32.7000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral