メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.240106787719 38.0292294422227, 138.239453774022 38.0293710284271, 138.239170135996 38.0287273081561, 138.239252251719 38.0287020102643, 138.239277353029 38.0286938993403, 138.239330413951 38.0286574148782, 138.239610119829 38.0285299240011, 138.240053397694 38.0289208712064, 138.240106787719 38.0292294422227)) ^^http://www.opengis.net/ont/geosparql#wktLiteral