メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.9062500 27.7958334, 128.9125000 27.7958334, 128.9125000 27.8000000, 128.9062500 27.8000000, 128.9062500 27.7958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral