メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.404739734902 44.1784411991961, 142.403687875787 44.1782703065046, 142.403868555913 44.1776994303523, 142.404893229546 44.1778610409876, 142.40492039215 44.1778653298877, 142.404739734902 44.1784411991961)) ^^http://www.opengis.net/ont/geosparql#wktLiteral