メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.331439359098 43.7525178451674, 142.33218381918 43.7527499902746, 142.33220311976 43.7527564464647, 142.331536848608 43.7538610844026, 142.330782866741 43.7536334949006, 142.330164492457 43.7534408965568, 142.33080418439 43.7523222382732, 142.331439359098 43.7525178451674)) ^^http://www.opengis.net/ont/geosparql#wktLiteral