メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.769342179011 43.1953975841009, 141.770005116756 43.1957332992193, 141.769326240567 43.1964450527808, 141.768675644055 43.1961161372457, 141.768424487362 43.1959667583035, 141.769073894151 43.195262833046, 141.769321593264 43.195387229054, 141.769342179011 43.1953975841009)) ^^http://www.opengis.net/ont/geosparql#wktLiteral