メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.273009593269 44.0190503516796, 144.271447240198 44.0188966892368, 144.271552414555 44.0183274968628, 144.273110767476 44.0184843346065, 144.273009593269 44.0190503516796)) ^^http://www.opengis.net/ont/geosparql#wktLiteral