メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.397720379147 44.1776027489325, 142.396520856709 44.1774188825272, 142.396501025106 44.1774151996809, 142.396771659298 44.1765782801288, 142.397974794436 44.1767674488401, 142.397720379147 44.1776027489325)) ^^http://www.opengis.net/ont/geosparql#wktLiteral