メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.311893476746 42.9534476084586, 141.310156330288 42.9535945290355, 141.310182094347 42.9534993001242, 141.310229924917 42.9532936912703, 141.310642120121 42.9520202917707, 141.311082050771 42.9522804704622, 141.311410193227 42.9524433771872, 141.311564626134 42.9525453611338, 141.311650762699 42.9526238566965, 141.311748166404 42.9527803711887, 141.311820334362 42.9529594671724, 141.311893476746 42.9534476084586)) ^^http://www.opengis.net/ont/geosparql#wktLiteral