メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.210821476459 42.9752273256457, 143.211907309658 42.9753118806897, 143.21179732184 42.9761645654651, 143.211720009605 42.9769075423579, 143.211619357219 42.9777754798776, 143.211537913847 42.9777675845494, 143.210807796798 42.9777088760002, 143.210379841389 42.9776723813471, 143.210327666362 42.9776679672134, 143.209509070663 42.9775983181486, 143.207774477804 42.9774534820461, 143.208043329555 42.9764216775317, 143.207921929222 42.9749923999033, 143.209718334324 42.9751381234351, 143.210761158609 42.975222628036, 143.210821476459 42.9752273256457)) ^^http://www.opengis.net/ont/geosparql#wktLiteral