メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.9125000 31.2541667, 130.9187500 31.2541667, 130.9187500 31.2583333, 130.9125000 31.2583333, 130.9125000 31.2541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral