メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.445860967776 43.8179587888558, 142.445707011865 43.8178583887504, 142.445349239646 43.8176373335275, 142.444564529371 43.8171389750063, 142.443771802741 43.8166422242789, 142.444851245859 43.81575066233, 142.446458009483 43.8167291795657, 142.446573045462 43.8166422583176, 142.446759759682 43.8167671939765, 142.447068731495 43.8169738414131, 142.446732457296 43.8172281733384, 142.445860967776 43.8179587888558)) ^^http://www.opengis.net/ont/geosparql#wktLiteral