メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.404893229546 44.1778610409876, 142.403868555913 44.1776994303523, 142.404085684974 44.177005660204, 142.405193884454 44.1771896593949, 142.405101427276 44.1774198424085, 142.405068851433 44.1774143314108, 142.404893229546 44.1778610409876)) ^^http://www.opengis.net/ont/geosparql#wktLiteral