メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.359193137225 43.7655807153674, 142.359513114463 43.7661505726855, 142.35801133028 43.7665834768848, 142.357670084575 43.7660187754865, 142.35736438519 43.7654614928858, 142.358886408018 43.7650176135759, 142.359193137225 43.7655807153674)) ^^http://www.opengis.net/ont/geosparql#wktLiteral