メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.373802413994 43.8227291219455, 142.372825265611 43.8220451955281, 142.37359762029 43.8214843371782, 142.374303954692 43.8209714139386, 142.374461783468 43.8208603302196, 142.37463171801 43.8207263443518, 142.375280036322 43.8202696478967, 142.376288286915 43.821022100123, 142.373802413994 43.8227291219455)) ^^http://www.opengis.net/ont/geosparql#wktLiteral