メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.348346302156 43.7711296710402, 142.348063809473 43.7711027400176, 142.346777486132 43.7712801503405, 142.346699367983 43.7710806461514, 142.346684640449 43.7710368655794, 142.348105699973 43.7706981089769, 142.348346302156 43.7711296710402)) ^^http://www.opengis.net/ont/geosparql#wktLiteral