メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((127.8812500 26.7000000, 127.8875000 26.7000000, 127.8875000 26.7041667, 127.8812500 26.7041667, 127.8812500 26.7000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral