メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3812500 35.3208334, 140.3875000 35.3208334, 140.3875000 35.3250000, 140.3812500 35.3250000, 140.3812500 35.3208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral