メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.904901580233 43.4896293860084, 141.904266844515 43.4897183383201, 141.904127532375 43.4892726479097, 141.903913131788 43.4885856183963, 141.904658788554 43.4884793851277, 141.904680784318 43.488475618303, 141.904717655798 43.4889740963264, 141.904901580233 43.4896293860084)) ^^http://www.opengis.net/ont/geosparql#wktLiteral