メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.394831926472 44.1778645813199, 142.393519789335 44.1776600943533, 142.39366245183 44.1771849468313, 142.394975703126 44.1773902559927, 142.394831926472 44.1778645813199)) ^^http://www.opengis.net/ont/geosparql#wktLiteral