メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.354661390828 43.7755303596702, 142.354129968149 43.7756781776366, 142.353894652299 43.7752553639732, 142.353664146151 43.7748546958968, 142.353657754499 43.7748422551264, 142.354181251046 43.7746949916297, 142.354661390828 43.7755303596702)) ^^http://www.opengis.net/ont/geosparql#wktLiteral