メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.324123037425 43.7631432121458, 142.324761170432 43.7633380789488, 142.324397402604 43.7639441885917, 142.324104795813 43.7644210529518, 142.32347112915 43.7642321044179, 142.323463734365 43.764244310243, 142.322991052649 43.7640972897463, 142.323089881049 43.7639163248661, 142.323647410594 43.7629970926024, 142.324123037425 43.7631432121458)) ^^http://www.opengis.net/ont/geosparql#wktLiteral