メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.405296569983 43.7776059769874, 142.405947138105 43.7780024578011, 142.404866062079 43.7789239927117, 142.404855393289 43.7789124376893, 142.4042794851 43.7785660096885, 142.404226132193 43.7785236408653, 142.402919568694 43.7776843750556, 142.403987936458 43.776794538759, 142.405296569983 43.7776059769874)) ^^http://www.opengis.net/ont/geosparql#wktLiteral