メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.3625000 35.4208334, 138.3687500 35.4208334, 138.3687500 35.4250000, 138.3625000 35.4250000, 138.3625000 35.4208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral