メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.31986029152 43.0673001324385, 141.320629384658 43.0674094136193, 141.320476677935 43.0680116653018, 141.320350691624 43.0685404283097, 141.319584834858 43.0684320160122, 141.318830623113 43.0683338900201, 141.318966436705 43.0677903686626, 141.319123236829 43.0672037654823, 141.31986029152 43.0673001324385)) ^^http://www.opengis.net/ont/geosparql#wktLiteral