メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((129.5250000 28.3250000, 129.5312500 28.3250000, 129.5312500 28.3291667, 129.5250000 28.3291667, 129.5250000 28.3250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral