メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.940333210094 42.9456911334563, 142.939160221082 42.9463947525988, 142.939124114383 42.9464148730971, 142.938336119383 42.9457039903059, 142.938075286808 42.9454679785198, 142.938123212858 42.945438785001, 142.939276899627 42.9447348703856, 142.939463187555 42.9449009266455, 142.940145436029 42.9455295888694, 142.940333210094 42.9456911334563)) ^^http://www.opengis.net/ont/geosparql#wktLiteral