メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.411490364989 43.8320169550413, 142.41128335131 43.8321566626428, 142.40968391541 43.8309604550498, 142.412056114849 43.8291518187042, 142.412928844867 43.8297917868023, 142.413741339017 43.8303809386678, 142.411490364989 43.8320169550413)) ^^http://www.opengis.net/ont/geosparql#wktLiteral