メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.649194445595 42.8256943968729, 141.648656065479 42.8261287577249, 141.648108180693 42.8265816338228, 141.646560253326 42.8255371197005, 141.647114964459 42.8250899135806, 141.647715855866 42.8246091879577, 141.649241008624 42.8256568024982, 141.649194445595 42.8256943968729)) ^^http://www.opengis.net/ont/geosparql#wktLiteral