メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.348621265332 43.7716954809518, 142.348546362548 43.7717033002976, 142.348390257149 43.7711334652267, 142.349664484478 43.7707387375908, 142.349735531413 43.7708553713314, 142.350039975682 43.7713958533678, 142.349326722165 43.7716003472985, 142.348621265332 43.7716954809518)) ^^http://www.opengis.net/ont/geosparql#wktLiteral