メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.38082457433 43.7535594328091, 142.37918753249 43.7540406646497, 142.378561641107 43.7529916585095, 142.378700629783 43.7529504353085, 142.380613645527 43.7523981539829, 142.380749231563 43.7530513567676, 142.38082457433 43.7535594328091)) ^^http://www.opengis.net/ont/geosparql#wktLiteral