メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.7187500 31.4666667, 130.7250000 31.4666667, 130.7250000 31.4708334, 130.7187500 31.4708334, 130.7187500 31.4666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral