メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.38374675418 43.7696460402261, 142.383724747553 43.7701701763704, 142.383701942435 43.7706684708264, 142.382330799602 43.7706034347367, 142.382075908497 43.7706671388074, 142.381459107854 43.7695594593651, 142.381363010235 43.7694076727651, 142.381559141642 43.7693393257779, 142.382326887573 43.7691713994343, 142.383714442093 43.7689045131615, 142.383802968627 43.7690738338239, 142.38374675418 43.7696460402261)) ^^http://www.opengis.net/ont/geosparql#wktLiteral