メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.711675835202 44.3681254011586, 141.711170401932 44.3684494453759, 141.710688854012 44.3687497983955, 141.709626318422 44.3679083188549, 141.7101146355 44.3675965755962, 141.710641942333 44.3672599493138, 141.711675835202 44.3681254011586)) ^^http://www.opengis.net/ont/geosparql#wktLiteral