メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.261138611788 44.027108460633, 144.259819892475 44.0266371572806, 144.260544827805 44.0255616802746, 144.261879175412 44.0260289161012, 144.261477000383 44.0265966231567, 144.261138611788 44.027108460633)) ^^http://www.opengis.net/ont/geosparql#wktLiteral