メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.414142664531 31.8972573017162, 131.414352041311 31.8973132068037, 131.41452478367 31.8973585908246, 131.414961714758 31.8974531486794, 131.415037213118 31.8981642670155, 131.415051130023 31.898164222094, 131.415181668427 31.8991855374914, 131.414677383327 31.8992136593809, 131.414217535045 31.8992417767611, 131.413671068929 31.8992757380188, 131.413665347716 31.8982630343364, 131.413666862743 31.8982140595927, 131.413653317622 31.8979092222618, 131.413604325262 31.8970828830195, 131.413647081162 31.8970953576579, 131.414142664531 31.8972573017162)) ^^http://www.opengis.net/ont/geosparql#wktLiteral