メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.650157099408 42.8263318145694, 141.649629878808 42.8267732011333, 141.649077411112 42.8272356932929, 141.648108180693 42.8265816338228, 141.648656065479 42.8261287577249, 141.649194445595 42.8256943968729, 141.650157099408 42.8263318145694)) ^^http://www.opengis.net/ont/geosparql#wktLiteral