メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.4000000 35.4250000, 137.4062500 35.4250000, 137.4062500 35.4291667, 137.4000000 35.4291667, 137.4000000 35.4250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral