メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.047914629183 42.9024017760554, 143.046389117318 42.9022869117963, 143.046615062691 42.9005817276703, 143.046804600382 42.9005948981205, 143.046931447529 42.9006055513048, 143.047713726627 42.9006707234446, 143.048641848658 42.9017985258931, 143.047955224858 42.9021042649428, 143.047914629183 42.9024017760554)) ^^http://www.opengis.net/ont/geosparql#wktLiteral