メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.391852556547 44.1822680957147, 142.392266184199 44.1823373379711, 142.3919062424 44.1835151585914, 142.39147243344 44.1834433046502, 142.390947594834 44.1833563697682, 142.391312010258 44.1821775959803, 142.391852556547 44.1822680957147)) ^^http://www.opengis.net/ont/geosparql#wktLiteral