メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.258630295911 44.0236417647759, 144.258328691266 44.0240831165715, 144.257005216293 44.0236300005373, 144.257033130858 44.0235851173155, 144.25730666596 44.0231780824523, 144.257957460354 44.0234060655823, 144.258630295911 44.0236417647759)) ^^http://www.opengis.net/ont/geosparql#wktLiteral