メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.326656722015 43.7613506625485, 142.327083059359 43.7614779563803, 142.326453358346 43.7625477930497, 142.326019729964 43.7624150165843, 142.325428949186 43.7622370556701, 142.325411113211 43.7622316874527, 142.326048097378 43.7611539752719, 142.326656722015 43.7613506625485)) ^^http://www.opengis.net/ont/geosparql#wktLiteral