メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.394328961245 44.1794625184333, 142.39303439748 44.1792552104961, 142.393216580612 44.178600496634, 142.394534553617 44.1788163003065, 142.394328961245 44.1794625184333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral