メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.388173719475 43.6842634501164, 142.387437310508 43.6855996573292, 142.386185268149 43.6852193862492, 142.385415589822 43.6849856198353, 142.386732427452 43.6826884791907, 142.387504084271 43.6829220931739, 142.388742011187 43.6832968106859, 142.388173719475 43.6842634501164)) ^^http://www.opengis.net/ont/geosparql#wktLiteral