メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.391950056043 44.1617350796549, 142.389184157502 44.1613080156604, 142.389568926481 44.1600570622313, 142.390899292052 44.1602676396146, 142.391837267104 44.1604151186942, 142.392323113758 44.160491480679, 142.391950056043 44.1617350796549)) ^^http://www.opengis.net/ont/geosparql#wktLiteral