メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.353744711539 43.0635133459796, 141.354578842814 43.0636236866971, 141.354282460373 43.0648090934951, 141.353435336908 43.0646874669662, 141.352673643885 43.0645880953963, 141.352972939226 43.0634023639543, 141.353744711539 43.0635133459796)) ^^http://www.opengis.net/ont/geosparql#wktLiteral