メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.403420057072 44.1860292794878, 142.403385229213 44.1860512117087, 142.401553675988 44.1858780368652, 142.400219960226 44.1857369670837, 142.399272139442 44.1851668521405, 142.399415370917 44.184725184921, 142.401257820332 44.1850575227568, 142.401801824565 44.1853020129572, 142.403420057072 44.1860292794878)) ^^http://www.opengis.net/ont/geosparql#wktLiteral