メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.939324707073 42.9430121051485, 142.93811412613 42.9437103826055, 142.937182149435 42.9428836058276, 142.93836687029 42.9421800785579, 142.939154100784 42.9428566446737, 142.939324707073 42.9430121051485)) ^^http://www.opengis.net/ont/geosparql#wktLiteral