メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.1250000 32.9875000, 129.1312500 32.9875000, 129.1312500 32.9916667, 129.1250000 32.9916667, 129.1250000 32.9875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral