メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.43593664605 31.9050083097415, 131.435643875895 31.9041395864026, 131.43606050584 31.9039568774258, 131.436486498228 31.9037977376096, 131.436748665233 31.9042097187189, 131.436420485812 31.90441622483, 131.436564495939 31.9046087841329, 131.436110812584 31.9049744585532, 131.43593664605 31.9050083097415)) ^^http://www.opengis.net/ont/geosparql#wktLiteral