メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.9500000 35.7916667, 137.9562500 35.7916667, 137.9562500 35.7958334, 137.9500000 35.7958334, 137.9500000 35.7916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral