メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.358324156104 43.7671173703639, 142.358594456506 43.7676410524994, 142.357028898871 43.7681202385573, 142.356723145864 43.7675760520206, 142.356438665826 43.7670421281782, 142.35801133028 43.7665834768848, 142.358324156104 43.7671173703639)) ^^http://www.opengis.net/ont/geosparql#wktLiteral