メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.8875000 27.8416667, 128.8937500 27.8416667, 128.8937500 27.8458334, 128.8875000 27.8458334, 128.8875000 27.8416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral