メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.9125000 34.7166667, 137.9187500 34.7166667, 137.9187500 34.7208334, 137.9125000 34.7208334, 137.9125000 34.7166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral