メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.372768288595 43.7507044320379, 142.372679933244 43.7510587892222, 142.372335950602 43.7511225325579, 142.372306929577 43.7510685384747, 142.371555500645 43.7496570495816, 142.373019457174 43.7492121870633, 142.373672586903 43.7504509570177, 142.372829991801 43.7504568875285, 142.372768288595 43.7507044320379)) ^^http://www.opengis.net/ont/geosparql#wktLiteral