メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.413741339017 43.8303809386678, 142.412928844867 43.8297917868023, 142.412056114849 43.8291518187042, 142.414512067084 43.8273716226488, 142.415430983765 43.8280298045673, 142.416228751323 43.8285890050204, 142.415012776237 43.8294621462385, 142.413741339017 43.8303809386678)) ^^http://www.opengis.net/ont/geosparql#wktLiteral