メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.9000000 27.8416667, 128.9062500 27.8416667, 128.9062500 27.8458334, 128.9000000 27.8458334, 128.9000000 27.8416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral