メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.4625000 34.1208334, 134.4687500 34.1208334, 134.4687500 34.1250000, 134.4625000 34.1250000, 134.4625000 34.1208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral