メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.4187500 33.8208334, 134.4250000 33.8208334, 134.4250000 33.8250000, 134.4187500 33.8250000, 134.4187500 33.8208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral