メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.498326186969 42.9514537068318, 141.498143991442 42.9517296838914, 141.497977156474 42.9519824121289, 141.497749142219 42.9523333426354, 141.497553712213 42.9526340578659, 141.49638802301 42.9522550536705, 141.497023319442 42.9513893111553, 141.497231853427 42.9511051394662, 141.4977141864 42.9504477618612, 141.498388117061 42.9506863840502, 141.498748460895 42.9508140057209, 141.498326186969 42.9514537068318)) ^^http://www.opengis.net/ont/geosparql#wktLiteral