メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.770922443458 43.1962003253992, 141.770254513837 43.1969018606723, 141.769326240567 43.1964450527808, 141.770005116756 43.1957332992193, 141.770922443458 43.1962003253992)) ^^http://www.opengis.net/ont/geosparql#wktLiteral