メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.395118346333 44.1722649077134, 142.39356337502 44.1720296809486, 142.393898318621 44.1709806637931, 142.395444372799 44.171236236903, 142.395118346333 44.1722649077134)) ^^http://www.opengis.net/ont/geosparql#wktLiteral