メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.904658788554 43.4884793851277, 141.903913131788 43.4885856183963, 141.903767696447 43.487966626613, 141.903496172628 43.4870570185167, 141.903506574742 43.4869316230974, 141.903545636425 43.4868697484872, 141.90360035262 43.4867769063993, 141.904161875832 43.4867166047284, 141.904658788554 43.4884793851277)) ^^http://www.opengis.net/ont/geosparql#wktLiteral