メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.3937500 28.3291667, 129.4000000 28.3291667, 129.4000000 28.3333333, 129.3937500 28.3333333, 129.3937500 28.3291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral