メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.7937500 32.6166667, 129.8000000 32.6166667, 129.8000000 32.6208334, 129.7937500 32.6208334, 129.7937500 32.6166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral