メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.387811753007 43.7780800709857, 142.386455941763 43.7784856256579, 142.386255162552 43.778063664415, 142.386389415455 43.7780343232646, 142.38618361987 43.7776135802514, 142.386133176147 43.7775868644543, 142.386022406924 43.7776137698689, 142.385511590432 43.7767128042901, 142.387285185462 43.7761814507953, 142.388264811854 43.777943262134, 142.387811753007 43.7780800709857)) ^^http://www.opengis.net/ont/geosparql#wktLiteral