メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.835163180058 43.0818036088756, 142.835097605876 43.0817890353042, 142.834554118159 43.0816795008165, 142.83499855722 43.0805960379037, 142.835611967567 43.0807344694362, 142.835571328348 43.0808295536147, 142.835468040897 43.0810712449192, 142.835163180058 43.0818036088756)) ^^http://www.opengis.net/ont/geosparql#wktLiteral