メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.905834683897 43.4985061360153, 141.905377392605 43.4985854601971, 141.905157860876 43.498623512968, 141.905124043804 43.4986287914448, 141.904768014574 43.4974505983001, 141.905018181011 43.4974098253502, 141.905539832561 43.4973248231068, 141.905834683897 43.4985061360153)) ^^http://www.opengis.net/ont/geosparql#wktLiteral