メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.8125000 32.6791667, 129.8187500 32.6791667, 129.8187500 32.6833333, 129.8125000 32.6833333, 129.8125000 32.6791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral