メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9125000 33.4875000, 129.9187500 33.4875000, 129.9187500 33.4916667, 129.9125000 33.4916667, 129.9125000 33.4875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral