メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.821459043713 34.7130067863679, 137.821430150721 34.7133690383464, 137.820538817785 34.7133181282927, 137.820561897977 34.7129633083373, 137.820581759612 34.7126576277841, 137.821479759711 34.7126953362136, 137.821471626578 34.7128345937565, 137.821459043713 34.7130067863679)) ^^http://www.opengis.net/ont/geosparql#wktLiteral