メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.328879424931 43.7543414038416, 142.3289569294 43.7543717653377, 142.329528469679 43.7545421634303, 142.328905094842 43.755608960505, 142.328306462559 43.755411802459, 142.327817506161 43.7552676608236, 142.328474076698 43.7542217839726, 142.328879424931 43.7543414038416)) ^^http://www.opengis.net/ont/geosparql#wktLiteral