メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.393781047006 44.1811846729733, 142.392683498703 44.1810058371429, 142.392485277153 44.1809735445736, 142.392724237078 44.1801721521573, 142.39303439748 44.1792552104961, 142.394328961245 44.1794625184333, 142.394035810295 44.1803839260868, 142.393781047006 44.1811846729733)) ^^http://www.opengis.net/ont/geosparql#wktLiteral