メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3187500 35.4208334, 140.3250000 35.4208334, 140.3250000 35.4250000, 140.3187500 35.4250000, 140.3187500 35.4208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral