メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.343833018696 43.7757573247128, 142.343277756967 43.7759233238356, 142.343000439945 43.7754398125672, 142.342929164399 43.775306577216, 142.3426809036 43.7748425554762, 142.343816704909 43.774519926734, 142.344674400154 43.7742826633735, 142.344825705009 43.7745462413634, 142.345024261557 43.7749335619681, 142.345261015263 43.7753468513724, 142.343833018696 43.7757573247128)) ^^http://www.opengis.net/ont/geosparql#wktLiteral