メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.6125000 34.7625000, 137.6187500 34.7625000, 137.6187500 34.7666667, 137.6125000 34.7666667, 137.6125000 34.7625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral