メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.403868555913 44.1776994303523, 142.40273986857 44.1775148827341, 142.403162267313 44.1768501814664, 142.404085684974 44.177005660204, 142.403868555913 44.1776994303523)) ^^http://www.opengis.net/ont/geosparql#wktLiteral