メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.391639978821 44.1696437400957, 142.388864815418 44.1691662799622, 142.389072939307 44.1685302588424, 142.389833725927 44.168658982839, 142.389844741774 44.1686028040331, 142.391899387111 44.1689176990097, 142.391639978821 44.1696437400957)) ^^http://www.opengis.net/ont/geosparql#wktLiteral