メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.9687500 33.2291667, 129.9750000 33.2291667, 129.9750000 33.2333333, 129.9687500 33.2333333, 129.9687500 33.2291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral