メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.349891972279 44.4759041859581, 142.349382727452 44.4757777163255, 142.349432603839 44.4756756127786, 142.34954435151 44.4754468192969, 142.349575034049 44.4753854437823, 142.349992926565 44.4745489771335, 142.350481757826 44.4746677274665, 142.349941498009 44.4758003598763, 142.349891972279 44.4759041859581)) ^^http://www.opengis.net/ont/geosparql#wktLiteral