メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.331008793896 43.7652775700832, 142.331787006247 43.7655108857404, 142.331384330031 43.7661887892535, 142.331130994408 43.7666289177805, 142.330363633429 43.7663924255275, 142.329689784204 43.7661832711137, 142.329915118664 43.7657954662429, 142.330322249812 43.7650686909708, 142.331008793896 43.7652775700832)) ^^http://www.opengis.net/ont/geosparql#wktLiteral