メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.347959075386 43.7764835875081, 142.348171667276 43.7769155076499, 142.346872099603 43.7772913324708, 142.346480757171 43.7774040625777, 142.346255606625 43.7769761937513, 142.346241337329 43.7769555664585, 142.346029059077 43.7765654475043, 142.346022509401 43.7765542016831, 142.347722665893 43.7760669832113, 142.347959075386 43.7764835875081)) ^^http://www.opengis.net/ont/geosparql#wktLiteral