メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.4437500 31.7958334, 130.4500000 31.7958334, 130.4500000 31.8000000, 130.4437500 31.8000000, 130.4437500 31.7958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral