メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.653344781287 42.8272367964896, 141.652974911025 42.8267744650377, 141.654433701773 42.8255443492438, 141.65463607751 42.8256733385541, 141.654843678154 42.8258055902534, 141.654201354895 42.8264114717532, 141.654019352974 42.8265831914004, 141.653344781287 42.8272367964896)) ^^http://www.opengis.net/ont/geosparql#wktLiteral