メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.8500000 32.7958334, 128.8562500 32.7958334, 128.8562500 32.8000000, 128.8500000 32.8000000, 128.8500000 32.7958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral