メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6750000 28.4250000, 129.6812500 28.4250000, 129.6812500 28.4291667, 129.6750000 28.4291667, 129.6750000 28.4250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral