メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.6625000 28.4791667, 129.6687500 28.4791667, 129.6687500 28.4833333, 129.6625000 28.4833333, 129.6625000 28.4791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral