メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.0687500 37.4208334, 137.0750000 37.4208334, 137.0750000 37.4250000, 137.0687500 37.4250000, 137.0687500 37.4208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral