メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.417896796195 43.8225407552269, 142.416965596859 43.8232338500576, 142.416455568563 43.8235884854453, 142.415376445334 43.8243729399506, 142.413770646628 43.8231998586403, 142.415344230569 43.822091403475, 142.41627169176 43.8213795870149, 142.417896796195 43.8225407552269)) ^^http://www.opengis.net/ont/geosparql#wktLiteral