メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.908893733906 43.5141761392299, 141.908643271586 43.5144876756018, 141.908519333143 43.5143532282664, 141.908121246703 43.5138553225372, 141.907579732678 43.5132834601944, 141.907256021814 43.5122022414105, 141.908099699428 43.5120846873223, 141.908281467305 43.5120517913086, 141.908565682433 43.5130378777678, 141.908893733906 43.5141761392299)) ^^http://www.opengis.net/ont/geosparql#wktLiteral