メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.905695895391 43.489512216417, 141.904901580233 43.4896293860084, 141.904717655798 43.4889740963264, 141.904680784318 43.488475618303, 141.905356125418 43.4883603066403, 141.905695895391 43.489512216417)) ^^http://www.opengis.net/ont/geosparql#wktLiteral