メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.7250000 33.4125000, 129.7312500 33.4125000, 129.7312500 33.4166667, 129.7250000 33.4166667, 129.7250000 33.4125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral