メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.396301536646 44.1780935153329, 142.394831926472 44.1778645813199, 142.394975703126 44.1773902559927, 142.395000188346 44.1773295418768, 142.396459760319 44.1775591900401, 142.396301536646 44.1780935153329)) ^^http://www.opengis.net/ont/geosparql#wktLiteral