メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.422230335695 43.7691632052156, 142.421626204948 43.7691816131761, 142.421057011753 43.7692096869616, 142.420950067761 43.7682404180478, 142.421534796246 43.7682106861314, 142.422146941713 43.7681825282851, 142.422230335695 43.7691632052156)) ^^http://www.opengis.net/ont/geosparql#wktLiteral