メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.351843599949 44.4802885862559, 142.351015913172 44.4800711074544, 142.350928796564 44.4800482274876, 142.351215414423 44.4795807101474, 142.351442363449 44.4790621248995, 142.352331571121 44.4792546183444, 142.351843599949 44.4802885862559)) ^^http://www.opengis.net/ont/geosparql#wktLiteral