メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.757687131192 43.2015495803595, 141.757391040641 43.2018420679448, 141.75712037044 43.2021112453964, 141.756220101247 43.2016588137747, 141.756472943384 43.2013773954225, 141.756757777323 43.2010743122865, 141.757687131192 43.2015495803595)) ^^http://www.opengis.net/ont/geosparql#wktLiteral