メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.2125000 31.8416667, 130.2187500 31.8416667, 130.2187500 31.8458334, 130.2125000 31.8458334, 130.2125000 31.8416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral