メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.452254867027 42.9887456091645, 141.451306705149 42.9881142603046, 141.452618665536 42.9870282012224, 141.452711929912 42.9869424129286, 141.453197914349 42.9879593981042, 141.453161691321 42.9879900207919, 141.452254867027 42.9887456091645)) ^^http://www.opengis.net/ont/geosparql#wktLiteral