メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.901443323303 43.4756656385637, 141.901766401534 43.4766958139148, 141.901167368807 43.4767988517958, 141.901162863088 43.4767807288642, 141.901115846345 43.476787126674, 141.900829196842 43.4758172921292, 141.90081361693 43.4757644661847, 141.900526734502 43.4747910078712, 141.901143620201 43.4746989632797, 141.901443323303 43.4756656385637)) ^^http://www.opengis.net/ont/geosparql#wktLiteral