メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.7000000 31.5291667, 130.7062500 31.5291667, 130.7062500 31.5333333, 130.7000000 31.5333333, 130.7000000 31.5291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral