メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.37843371765 42.9822533827143, 144.376659364992 42.9819410330285, 144.376860460659 42.981278745324, 144.376942148692 42.9812922053853, 144.378645728293 42.9816081207581, 144.37843371765 42.9822533827143)) ^^http://www.opengis.net/ont/geosparql#wktLiteral