メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.362458690444 43.7684643279289, 142.362769077734 43.7690300564734, 142.361320485414 43.7694453218845, 142.361004321471 43.768876028508, 142.360686297635 43.768303394877, 142.362136735613 43.7678775150607, 142.362458690444 43.7684643279289)) ^^http://www.opengis.net/ont/geosparql#wktLiteral