メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.413657444565 43.8267990796714, 142.414512067084 43.8273716226488, 142.412056114849 43.8291518187042, 142.411236548992 43.8285479510881, 142.410468382024 43.8279565051201, 142.411691718433 43.827051239132, 142.412874372415 43.8261808939612, 142.413657444565 43.8267990796714)) ^^http://www.opengis.net/ont/geosparql#wktLiteral