メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.370116523746 43.7662438531453, 142.370421032848 43.7667939392326, 142.36887412256 43.7672460470798, 142.368568353659 43.766689823524, 142.368243851724 43.7661039599147, 142.369791716896 43.7656571853943, 142.370116523746 43.7662438531453)) ^^http://www.opengis.net/ont/geosparql#wktLiteral