メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.905208170179 43.4961890054004, 141.904476349843 43.4962949967421, 141.904096294947 43.4951714783519, 141.904879601767 43.4950505588332, 141.905208170179 43.4961890054004)) ^^http://www.opengis.net/ont/geosparql#wktLiteral